Great customer service. Great pricing and fast service. Will be a returning customer. Ernie is honest, trustworthy and reliable

Perfect example on how I love to deal with referrals. I was highly recommended from brother's auto parts in Ontario. My truck needed a new catalytic converter. My truck was fixed within 4 hours. My truck is running excellent like a new truck off the lot. Thanks to you all for the outstanding service. read more

Extremely great customer service. They had fair pricing and they finished installing my muffler within 2 hours. It sounded great and they made sure they did it the right way. They communicated everything they were going to do. Highly recommend. read more

Ernie and the crew had my 2001 F250 diesel truck up and ready in a few hours. My truck had what can only be described as a tin can at the end of it which made it sound like ish. Ernie made some recommendations based on the fact my dad drives this truck daily to and from work and I didn't want it loud and more obnoxious than it was. The finished result was awesome. Muffler and exhaust tip look better than factory. The sound is just right read more

The Muffler Doctor - The finished product, nice exhaust tip and sounds good. - Body Shops Near Me - Montclair, California

What can I say, when it comes to getting work done, Ernie is my go to. Guys been here for Years and knows his stuff. In and out. Quick and way and I was ready to go! He's fair on pricing., reliable work, and knows a few things about cars as well. I'll be having him do my truck next. read more

The Muffler Doctor - Ek9 getting the Mugen twin loop treatment.... - Body Shops Near Me - Montclair, California

I had to get a catalytic converter shield for my prius after it was stolen. No auto repair store carries the parts. You can only have it done by a muffler professional to wield it on. I went to multiple places in the area. Ernie was very nice and informative. He advised not to get any product off Amazon. He had the parts in the shop. Instead of waiting over the weekend, he was able to install one for me that day for a decent price. Go to The Muffler Doctor for nice quick service. read more

The Muffler Doctor, where they won't necessarily put all the bolts back in and, when they can't find your bolt and see that the gasket is broken, will glue the flange as a quick fix. I'm impressed! Yeah, not really. There is no excuse for not doing it right the first time. read more

The Muffler Doctor - Body Shops Near Me - Montclair, California

I had a rattling noise and deep humming coming from my car whenever it was running. I brought it to the dealership and they quoted me a non-sense cost of over $2,000 dollars and told me I would need to have my entire exhaust replaced all the way up to the Catalytic Converter. I called Ernie at The Muffler Doctor for a second opinion and was astonished when he told me that there was a small section of my exhaust that had been rusted and that he could repair for SIGNIFICANTLY less. It only took Ernie 20 minutes and my car is completely fixed with no rattling or humming. He was extremely efficient and honest. These guys know what they are doing and are both ethical and kind. I would highly recommend doing business with these guys, hands down the easiest experience I have had with car repair. read more

Been going here for a couple years but today was the last time i do. They definitely know what they're doing but some have no work ethic or costumer service. You would think they'd hook raza up but some seem shady. smh... read more

Was having difficult finding a good muffler shop for my motorcycle to get some exhaust work done and brought it in to this location and they did a excellent job and getting what I needed done along with my bike sounding great. Great work and custom service thanks! read more

I have here for a few vehicles. All times has been to just put in an aftermarket muffler to get a little rumble. They are always friendly and prices are competitive. Most importantly, I never had any issues with their work. Highly recommend! read more

The guys at Muffler Doctor will do right by you get the work you need done, I had an issue with my Catalytic converter going bad and they advised me of a mechanic to go to get the underlying issue solved and then got the catalytic converters installed and got me setup for my smog and ready to go back on the road was overall very happy with the team at Muffler Doctor read more

IF YOU NEED EXHAUST WORK, DON'T GO ANYWHERE ELSE. I was recommended by one of my best friends to come here and of course I had to go the first chance I got. I am so glad we have stumbled upon this exhaust shop. Great people, stellar customer service, speedy service and unbeatable prices! I came here to swap my OEM resonator with an aftermarket Vibrant bottle-style resonator and the price was only $50 out the door. The work only took about 25 minutes and the owner was super friendly and understanding while I was filming for my Youtube channel. I was able to film and watch the whole process safely. Luckily for me this shop is close, but honestly speaking even if it were 20-25 miles away I'd make the drive down knowing how great the work and their service is. I doubt this will be my last time here for some exhaust work so I'm looking forward to my next visit! Be on the lookout for the video to get more in depth footage of the shop and the work that they did. I left the shop ecstatic and ready for more exhaust work to be done! Youtube Video of Installation: https://www.youtube.com/watch?v=dn31AiyxUlQ&t=106s read more

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This place came through big time! Specifically Ernie. What I thought would be an easy home install, turned out to be a headache. I could not get the existing studs out of my Y-pipe. So I call these guys on a Saturday morning, Presidents' Day weekend. They say come on down, they can get me in. I go down there and they get the studs out in a minute. Then when my new muffler was being installed, we realized the online retailer I ordered it from, sent me the wrong length (too long). Ernie was able to cut and weld it to make it fit like magic. All for a reasonable price. Thank you Muffler Doctor for getting me back out on the road fast! read more

Came here to have a J-Pipe installed on my 3 inch catback exhaust to kill my freeway drone in the 3k -4k rpm range. I did all my calculations at home, brought the Vibrant piping needed for the job, and asked Ernie if he could fab up the piping for me. I was in and out in less than 2 hours and paid a very reasonable price. Welds look good and the shop did exactly what I asked them to. Would 10/10 recommend to any friend needing custom exhaust work done to go here. read more

The Muffler Doctor - Garage Area - Body Shops Near Me - Montclair, California

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These guys are great. They customize the work to your liking with their expert advice. The guys are very skilled at what they do. It's impressive. I had them remove the rear resonators on my V6 Challenger and it sounds very good. I realize it will never sound like a V8, but the sound is definitely tough and good enough. They have other customizations they can do, but they don't oversell you. They really want you to get what you like and desire. My job was done within an hour! Highly recommended. read more

Amazing service, quality work and reasonably priced. Took me in same day and had my vechile rolling within an hour

Went to this shop to get my exhaust adjusted. Ernie was super helpful and the work was clean. The shop was well maintained and everyone there was eager to help. Definitely recommend this place. read more

Went to "da shop" yesterday to get my TRD Muffler repositioned because Advance Muffler Shop of Riverside didn't do a good job. However their rating would be on their Yelp page, not this one. Ernie saw the exhaust set up and immediately asked "Where'd you get this done?" And "Did the shop owner really leave it like this?" Big time SMH. I had called and made an appointment for me and my friend and we drove to Montclair and arrived on time. My buddy got my old set up on his car and I got my exhaust repositioned. We were both charged fair and reasonable prices! Just wanted to make an update review to show the shop some love! Never a disappointment coming here. Third Review: 01/17/20 I'm moving on from a 2006 Toyota Matrix (1ZZFE) to a 2003 Toyota Matrix XRS (2ZZGE) and I've decided to make my daily bone stock again! At first I was debating whether to save a trip by going to the local shops in my area, but I saw the reviews and immediately considered staying with the OG. Uneven welds and a lot of money spent is TOTALLY NOT WORTH IT. Scheduled to meet with Ernie today in the morning an hour after opening. I had to wait a little bit but that doesn't concern me at all. I conversed with another gentleman there about his lowered 2001 Suburban! Will definitely come back next time when I get the project car. Always a great experience here at the Muffler Doctor. Big thanks for their services! read more

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Amazing service.. I called mid week spoke with Ernie. Appt next day!! - nice!! I go there hes like muffler delete and add some straight pipes? Yes sir!! Drive it on back I'll meet you around back. They put it on the lift immediately. They have low ramps for lowered cars too. 2 guys jumped on to help. Started cutting out the stock mufflers. Measuring for the straight pipe. Lined it all up nice bends in the pipes (photos soon to come) and welded tight. Car Sounds awesome!! I payed cash. Was in and out in less than an hour. I will recomend this place to others!! Fast, detailed, & extremely reasonably priced. Thanks Ernie!! Shop owners cool too!! read more

The Muffler Doctor - Stock mufflers. - Body Shops Near Me - Montclair, California

Called them 9am in the morning and asked if they had any open slots for the day for a resonator delete. Got to the shop at 10:30 and they finished everything by 11:30. Shout out to Ernie for being super straight forward and the fast service! Would Highly recommend! read more

The Muffler Doctor - Dual 4-in tips on civic hatchback sport - Body Shops Near Me - Montclair, California

My daughter took my car in thought the it needed a Cadillac converter and a Oxygen sensor but the converter was ok they did other work on my car never touched the sensor and way over charged me on the work they did. Never again will I go go back . read more

These few years have been rough and to top it off, I found out my catalytic converter was stolen while parked in the front of my house. I called around a few places and I am glad I found Ernie. He thoroughly explained what was needed for a replacement and gave an honest upfront price. The work is excellent and got my car up and running again in about an hour. I am a new customer and I can tell he treats everyone like a VIP. It is good to meet honest and hardworking people like his crew. Thank you Ernie for your service and expertise! read more

The Muffler Doctor - Body Shops Near Me - Montclair, California

Put a Magnaflow on my 2019 Nissan frontier . V-6 - 4.0 automatic. big difference . back to 20 mpg. hwy.70 mph : 40 mph is 1100 rpm. like it's idling . little growl on accelerating ; 60-70 mph quiet like old muffler. glad to have changed it out every time I drive. floor it & you'll feel the difference. thanks - Ernie. mike @ frank & sons read more

My car's catalytic converter was stolen. The 1st muffler shop wouldn't do a temporarily fix, but they also couldn't replace the missing converter because the O2 sensor harness was damaged in the theft. Decided to call a 2nd muffler shop (The Muffler Doctor), explained the situation and asked if they could patch me up enough to make the car driveable. Spoke with Ernie who was super helpful and able to do the temp repair the same day. Was done in less than 20 minutes. Ernie even recommended a nearby Automotive Electrical specialist. No one likes being stolen from or their car being mutilated like that. But Ernie took a bad situation and made my day x100 better. I know its just a patch job and the real repair will take time/money, but its great to have someone with empathy when facing this situation. Highly recommend. Ask for Ernie. read more

I was going to take my truck to do some mufflers as well as a Mustang 5.0. They refused to do a sound check before welding. I would recommend Brothers Mufflers in fontana. They are extremely workable, don't try to rush you and will sound check as many mufflers as you'd like at no extra charge to ensure you are happy with the exhaust before they weld. I told the person on the phone that I would be leaving a review and he said "I don't care, we have enough business" I hope the owner sees this and speaks to that employee. read more

Victim of catalytic converter theft? Me too! Despite the stressful setback, a silver lining was finding an honest and detailed shop like Muffler Doctor. Ernie and the crew are willing to help with quality work, informed decision making and reasonable prices. I was able to tow my vehicle to the shop and drive it home that same-day. read more

Stopped by yesterday to inquire about exhaust upgrade for Chrysler 300c. Ernie hooked me up big time. He scheduled me in the next day and was done in around an hour. Now my car sounds like the Hemi breathing beast it was meant to be. Thanks Ernie!!! read more

Great experience! And excellence service! Very professional and quick! Had my exhaust done here two and a half years ago and recently started having problems with the weld on the muffler, which was a manufacture defect. My warranty was 6 months past the warranty date so i took my car in with my receipt and they put a new muffler on with no question and hooked me up only charging me 20 bucks for labor. I highly recommend the muffler doctor....will definitely be returning if i run in to any other problems with my car in the future! read more

Someone stole my catalytic converter. I called different places gave me different quotes. I called the Muffler Doctor and Ernie answered who gave me a reasonable quote and worked with me on my issue. He was straightforward and on point. I made an appointment the following day and fixed my problem right there. I will recommend this place to my family and friends. read more

I knew I wanted a muffler louder than my stock one but not super loud, they were able to find me just what I was looking for. After getting my truck done I'm taking my new bronco there next week. Awesome service! read more

The Muffler Doctor is great! I talked to Ernie about installing a Flowmaster Muffler on my Silverado. I came in at 4:20 on a Thursday (they closed at 5) and they had my truck in and out by 4:50. Highly recommend this to anybody looking to get exhaust work done. read more

These guys are great at what they do!! I asked about an installation for an exhaust install and a time was available the next morning, in less than an hour I was in and out the door! I also asked if they could adjust my mid-piping and they did it free of charge! The pricing was affordable and I felt I wasn't being cheated out of anything. Can't recommend them enough, I will continue to hit them up for my muffler needs. Thank you! read more

I stopped by early this morning without an appointment, but Ernie made himself readily available to discuss my needs and options for replacing my current old and failing muffler. The shop was buzzin' with the shop crew taking care of customer after customer, and Ernie kept me company while I waited with conversations of old school DJs and old/classic hits. He set me up with a new Magnaflow muffler paired with my original Fujitsubo pipe and now the car sounds great again: silent at idle, low and deep while accelerating, and very manageable while cruising at highway speeds. Very much appreciate the last minute accommodation, speed, and quality of the work. Great guy and great shop. Look forward to coming back in the future! read more

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Came here to have a muffler installed. I already had the muffler just needed the old one taken off and the new one welded on. Was met by Ernie. Listened to exactly what I wanted. Then took my car back and absolutely knocked it out the park. Fast and efficient and great service. Will definitely use again!! read more

The Muffler Doctor - Body Shops Near Me - Montclair, California

I had my Cadillac converter stolen and my insurance recommended this place. I had it replaced and to find out not only did they do it wrong once but there times. Had to take to a Honda dealership and they had to call this shop to give them the spec's and measurements on how to install it. After two Cadillac converters and 4 sensors later it still not right. Working with my insurance company now to see WHAT NEXT! read more

These guys are awesome and HONEST. Recently backed up into a huge rock and messed up my muffler they fixed it at a reasonable price & did it pretty fast. Would definitely recommend them to a friend or fam. read more

I had a plate bolted over my catalytic converters to protect it against theft. Reasonable price and friendly service. A few years ago I had them put a flow master on F150. It sounds amazing, no problems with it. Highly recommend. read more

The Muffler Doctor - Plate bolted over my catalytic converters to protect it against theft. - Body Shops Near Me - Montclair, California

Today I had the pleasure of meeting, Ernie. We discussed an exhaust system for my 2011 Toyota Tundra. I mentioned to Ernie that I didn't want a exhaust that sounded too aggressive . Ernie recommended a, 2-Chamber Flowmaster. He hit it right on the mark. After a only a 45 minute wait, Flowmaster was installed, sounded clean with just the right amount of rumble. Ernie also installed a matte finished exhaust tip to compliment my new Flowmaster. I walked away very happy and with a new, Muffler Doctor T-shirt. (See pictures) read more

The Muffler Doctor - Matte finished tip on my 2011 Toyota Tundra. - Body Shops Near Me - Montclair, California

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Recently I was a victim of catalytic converter theft, a rising crime in Ontario and surrounding areas. I am so grateful for Ernie and his crew at The Muffler Doctor. The second I called I knew I was in good hands. Being a local, Ernie truly sympathized with my situation and helped me get my Prius back on the road and made it quiet once again. No more dirty looks as I drove down the road when people wondered why my Prius sounded like a motorcycle! If you are a victim of this crime please give The Muffler Doctor a call. You will receive honest and excellent service at a fair reasonable price. Come on down, The Doctor is in! read more