Definitely recommend this shop to anybody looking to get work done on their car. The owner, JR, is amazing and truly goes above and beyond for his customers. From start to finish, the customer service was top tier and they made the whole process easy and stress-free. You can tell they genuinely care about the quality of their work and taking care of people the right way. Very professional, honest, and reliable. Don't waste your time going to other shops give this place a call if you need any work done on your vehicle. Highly recommend! read more

JR is phenomenal! We have been using him and his team for years. Several cars and trucks later and we still are going back no matter if we move or not. Hes the first and only shops we refer everyone over too!!! His wife is amazing too! She's very friendly and great at running the front desk and efficiently helping with out making the environment feel too strange having a husband wife work together. They are the best!! We started our venture with JR in 2013 and will continue our business so long as we keep getting vehicles needing exhaust. Pricing is always amazing and his knowledge and expertise as well.! Best bang for your buck. He always goes out of his way to ensure your happy and even has you come back if you feel something may be off. ( he's offered but we have never had any complaints). The best thing he's done for us is cutting the exhaust and putting several exhaust pipes and tips to allow us to hear the sound and then even gone back to several of them showing us 2 and 3 times on the same ones to really be sure before welding begins. I can't say enough positive things! We're very happy and will continue our business with JR! Get ready we have some more vehicles heading your way soon lol. Few family members in the market for more sound, performance, and quality read more

I haven't checked the welding yet. I am reading some of the recent comments and images and all of the welding looks horrible. I am going to check under my truck, then I will give an honest review, but for now, I am going to say that after getting the cat replaced, when I took it to get it smogged, it passed. I have no codes and after some TLC it runs better. But I'm a check and I'll get back at you, I cant right now because it is a drag to do but I'll get it checked this weekend. read more

Fast and reasonable. I would come back if I needed anymore Exhaust or muffler service.

most definitely one of the best muffler shops in town. i came in 7/3/25 with my 2016 mustang GT and told JR i wanted a x-pipe installed for the "loud raspy tone". he came back to me and said let's just put a straight mid pipe in. boy oh boy was i shocked of the results. great customer service, amazing valued brands with many to choose from. high quality at that. he also readjusted my pipes to fit properly with my bumper. all for just $250.00 . thanks again JR! i highly recommend the work here! read more

JR is very knowledgeable and committed to solving whatever your problem is. His expertise is beyond comparison!

JR was very polite and informative he gave me a great price and excellent workmanship. I would definitely recommend Autocross performance

Took my dodge journey by this business first thing in the morning and let me tell you, JR is the MAN! Love this guy. Super knowledgeable, educational and passionate in his business. I've never met a more well spoken person when it comes to explaining or getting certain things done to a vehicle. I got a rear muffler delete done. JRs guys made my suv sound insanely good and to my taste. Guy definitely lays out all your options gives you pleanty of routes to achieve your goal with your ride. Wether its sounds, looks or performance this man will take amazing care of you. I was extremely happy with my results. this business will not disappoint you. Shout out to you and your guys JR! read more

Great customer service and also reasonable prices. JR is very helpful and acknowledging when it comes to my vehicle and what I am trying to get done, also within a timely manner. I have had two cars worked on here and I love both of them read more

J.R. Is awesome and very knowledgeable!! I wanted to give my 2022 Corolla LE just a little more sound, I didn't want to sound racer. He knew exactly what I was looking for and recommended the Borla muffler. I couldn't be happier, it's exactly what I was looking for!! Thanks to all the staff at AP&M!! Definitely recommend this place!! read more

Autocross Performance & Muffler - Auto Repair Near Me - Lake Elsinore, California

Great customer service! Really helped me out with getting how I wanted my car to sound. Also was very quick in and out!

Called asking to get my exhaust done and how much it would be. Over the phone he told me that there one of the only places that lets you listen to all the mufflers before you choose to see what you like. I got quoted 230$ for the muffler and labor. Said he could get me in as soon as possible so I went down there, once they finished I was confused because I never chose a muffler but basically this guy decided that a straight pipe after the catalytic converters would be the best option. So in the end I spent 200$ for something I could've done myself at home for 50$. I definitely am not happy with what I ended up with and I'm thinking of going down there and getting a refund. I'm not one to write a bad review because he was a nice guy but screwing someone over for what you told them you'd do is not something I agree with. read more

My work truck had a problem with the catalytic converters and JR went out of his way to repair my truck and get it back on the road the very next day. read more

I was in n out in 20 min for Alfa Romero guilia exhaust job sounds just like a 2500$ job for 170$

You could trust. These guys are just about anything that has to do with the exhaust system and more. Also, he does the hydrogen clean that removes all the carbon from yours motor. It really works. I'm getting an extra 50 miles a tank on my F450. read more

Autocross Performance & Muffler - 2006, F450 king Ranch Dually,long bed king cab Try the Hydrogen clean Your vehicle will love you - Auto Repair Near Me - Lake Elsinore, California

JR is awesome. He is very knowledgeable. He will take his time with you and work with your budget. read more

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Thank you so much to everybody at autocross. I don't trust anybody else to do my exhaust but you guys. Once again thank you read more

Autocross Performance & Muffler - Thank you to the team at Auto Aid. You guys always take care of me and I don't trust anybody else to do my exhaust - Auto Repair Near Me - Lake Elsinore, California

JR is the man! Excellent service and recommendations based on what you're looking for! Couldn't be any happier, Thank you!

JR, Owner and Pedro, Expert Mechanic did absolutely an amazing, excellent, and outstanding job on my 1981 Datsun 280ZX car! I purchased a California Compliant Catalytic Converter, Installation and break procedure, Fixed and repaired, and replaced hoses, Deep Clean Hydro Tune-Up with throttle, and Body cleaning! JR, is fair, reasonable, professional, and is an expert of many years in the vehicles i.e. cars, truck, et-cetera industry! Has been in his own business for 10+ years, too! Pedro, Mechanic is thorough and completes what is necessary and needed in a very successful manner, too! JR, Owner also recommended to me, to go to Paisano Smog Check in Lake Elsinore, CA. I went to Paisano Smog Check and passed the smog check in flying colors! We highly recommend Autocross for all of your emission needs, Tune-ups, Suspension, OEM to high performance mufflers, custom exhaust and more at 289 San Jacinto River Road, #3 way in the back and turn left at the end sign, go towards the end and turn left again! Telephone Number: 1-951-245-3833. Respectfully Submitted, Gloria J. Moreno and Sonya M. von Moltke Milena, Temecula, CA. Customers read more

Thank you to J.R. and his crew for helping me get my catalytic converter troubles all stitched out. J.R. Is a very genuine guy and will reassure you of any of your worries and answer all questions you may have to the best of his ability. read more

JR is a crook..will promise you the world till you pay then wash his hands with any issue! Mans a pro Consumer beware! He will not only take your money but leave your vehicle worst off with no shame! Blaming you along the way. Man has no respect or honor consumer beware!! read more

I called in the phone was answered right away . Talked with the shop about my issues. My exhaust was to loud because I changed it. He tested fitted A few options till I found a sound I liked and would pass the sound test for the local police. I will go again Clean shop Nice guy Fair cost. read more

Great communication, very friendly and true to his word. JR got me high quality exhaust sound for a great price. Got it done in less than an hour. Highly recommend!! read more

Autocross Performance & Muffler - 2016 Dodge charger - Auto Repair Near Me - Lake Elsinore, California

Vehicle didn't pass smog due to wrong Cadillac converter (installed previously out of town due to theft). Helped me find the correct one and replaced it for me for a great price. Worked around my schedule and did it in about half an hour, super nice and very knowledgeable about their job and performance. Also very good with communicating to find out what you need. Definitely recommend, thank you! read more

brought my integra in to quiet it down some and got it to sound exactly how i wanted it too and very helpful. 10 out of 10

Called them at 1:30 on Labor Day weekend Saturday afternoon needing a vintage motorcycle muffler repaired. They said to bring it in and handled it even though they were trying to close early for the holiday. They did a great job! read more

Got in an accident two days ago and needed it fixed ASAP because of a cross country move I'm making TOMORROW. JR got me in and him and his team had me in and out of the shop within an hour with a fix that'll get me the 2k+ miles I'm driving. Very polite and knowledgeable with the options he gave to get me on the road and FAST! Wonderful service, would be my new shop if I wasn't moving. JR thank you so much! read more

Great work. Fast and excellent service! Came in to get Borla sport mufflers put on my 19 mustang gt. Took about 20 mins. Came in talked with the owner about car stuff and not long my car was ready to go! read more

More than helpful but, best of all extremely knowledgeable and helpful with his experience and savvy options based on his experience and honesty principles not expensive options but the best option available! JR, the owner, offered discounts for Veterans! read more

Very helpful and quick, explained all the details and showed me several different options to satisfy my taste.

Got my axle back exhaust installed here.. JR was very helpful and honest. Communicated with me even before i went to his shop. I loved the work they do to my car. It sounds amazing and looks great. Oh, & shoutout to PEDRO who let me watch him do work, like its his own car. Pride and dedication of the work he does. Highly recommended read more

initiallly not knowing any good muffler shops in Lake Elsinore... But I was pleasantly surprised on the professionalism and value I found with Autocross muffler. Found out my Chevy S10 also needed a catalytic converter but also a muffler that had gone rusted straight through... They even let me select among many options of sounds of mufflers and a great price... I highly recommend them!! . . read more

JR and his crew at Autocross were absolutely fantastic. They were able to help me the same day and they were not nearly as expensive as I expected based on other shops estimates. Thank you all for a wonderful experience! Mike read more

Called on a Saturday morning to see if he could replace a rattling resonator, he said come down and he could get it done. JR was very familiar with GTI's, cut out the old resonator, replaced and rerouted exhaust so no rubbing. Did a great job at a fair price in a short time. Exhaust sounds great too. read more

Amazing work!! Got us right in when no one else would !! Not only helped with the muffler but gave my son tips on other ways he could work on the car himself if needed! Definitely 5 star service! read more

One stop shop for your exhaust needs. Came in with a super loud Exhaust. Helped me out, gave me an affordable solution and did the job on the spot. Awesome!!!! read more

I am new to California and understand that it is a very restrictive state in general but when it comes to vehicle modifications it is especially rigorous. I stated this to the owner and he advised me that he was friends with local PD and Chiefs and that his modification to delete the rear mufflers would keep me legal. I originally asked for the rear mufflers to be deleted and I was told by him that they needed to remain in place to prevent being pulled over. I said ok, makes sense, keep in mind I'm a new California resident. His approach was to cut the exhaust just after the resonators and install 2 turn downs- $230. I was ok with the price bc I figured that's what it was. A few days later I took my vehicle to a few shops to get their opinions bc it was just too loud.. both shops looked at it and laughed then proceeded to tell me I was lied to and the guy was just lazy and didn't want to cut and bend new exhaust tubing. I had it done by another shop and it was actually less than what I was originally charged. read more

Autocross Performance & Muffler - Auto Repair Near Me - Lake Elsinore, California

JR is very knowledgable and helpful. He even stayed late to accommodate my car. He takes care of his customers fairly and honestly. I will be referring everyone that I know. I would give 10 starts if allowed to. read more

This place is a joke don't ever take your cars or trucks here if you care about it. This guy got in my truck trying to sell me on all junk no name brand mufflers. Revving my engine like he owns it to sound test. Save yourself time and go to a better muffler shop this place is garbage! read more

Wanted to put my cold air intake on so I went on yelp and saw the reviews about this place so decided to try them out. Was so glad I did because these guys are so knowledgeable and knew exactly what to do. Everything went about as smoothly as it possibly could, and the best part was after I left they actually called me to ask me how my car was running, and to offer to come back and try something different if I didn't like it. Really great shop, good honest guys working there, definitely a diamond in the rough thanks again boys! read more