The owner is a knowledgeable, friendly, and an awesome guy. He did a muffler and resonator delete on my 05 g35 with a turn down pipe right past the resonator. It sounds amazing and the turndown has saved me many tickets. Would recommend to anyone who needs exhaust work!

True professionals! Took a detailed look at the issue with my vehicle and explained it to me step by step. They even made time to get my vehicle taken care of within the same day even though they were closing. Most honest and comfortable repair service I’ve had in a long time. Thank you! You have a customer for life!

Long story short I took my Dodge Charger in for exhaust at another muffler shop and was disappointed in the work . Took it in to Apm got a resonator delete . The fact that he takes his time to actually explain to you the differences between different applications makes the difference, makes you feel welcomed and is there to answer any question you have . Love the way my car sounds great job !!!

The owner is very nice and easy to talk to and is very detailed and helpful. Not like other mechanics, is honest and and helpful, tells you what the problem is and explains what is wrong. Best mechanic in Souther California, I highly recommended.

Honesty and Quality of work go a long way in the auto service industry. I would recommend these guys to anyone. J.R. Really is totally honest and they do amazing, quality work! -Blair Hearnsberger

J.R. was more than fair in price and was very funny and kind, if any issues arise or if I have more exhaust needs, this is definitely where I will be going

Very straightforward and friendly answered questions and explained things thoroughly I got a free monster too haha

These guys get you in and handle the job, customer service is great you can easily wait for your vehicle comfortably with no worries, the employees are well fitted for whatever you throw At them leaving you with clean honest work. I appreciate the job they’ve done on my truck and will continue to come back for future needs! 🤙

My experience hear was fantastic! These guy’s know there stuff. No doubt if you want the job done right and for the best price, go see them! You will be happy you did!

J.r was great excellent and fast service cut and welded a new cat and a aerodynamic muffler car sounds and runs better then ever!

JR was awesomeHad a couple of o2 sensors stuck in the pipe and he took care of it for me.Very professional and not a long wait time.Prices are the best in townI highly suggest going to this shop for any exhaust upgrades or repairs.6 out of 5 stars for me..😎👍

Had my exhaust done to day JR is a nice and good guy. My 2500hd sounds great. I would or will tell all my friends to get work there. Just had a great experiment.

Wanted more umph from my 5.3 chevy Tahoe but not too much drone noise. I have been researching mufflers on the internet...way too many options and sounds...Could not figure which product I wanted and was not given much help from shops (was not offered to hear different mufflers) until I contacted AutoCross Performance & Muffler. Spoke to JR and he told me to come down and he will let me listen to a few mufflers. KOOL!! Just what I needed. JR had me listen to a few, and of course I choose the last one which of course I liked the best. JR had his guy install the new Borla Pro Xs muffler that I had chosen. Could not be happier with the product, sound and job. I have to tell you, if it was not for JR allowing me to listen to different options, which no other shop offered me to do the same, I would have not chosen the right muffler for me. AutoCross Performance & Muffler definitely aim to please. Thank you very much to JR, Jennifer and the nice man that installed the Borla...sorry I forgot your name. Go to AutoCross Performance & Muffler....Great Job, Great Products.....just Great People!! Praise God!

Amazing service, in and out within 20 minutes!

If I didn’t get such good service I would have given them 1 star. Was radically overcharged for 4 simple pieces of 3” exhaust tube that needed 1 end expanded. 16” of pipe charged $100. But they took care of me quickly. Had to go back today because 2 of the 4 were wrong and they were too busy to fix the issue owner just scrambled to give me a refund. Ended up going to Canyon Lake muffler had all 4 remade and was charged $20... owner here was nice but just seemed to be out of control. Won’t be back.

Called JR to help make the exhaust on my 2011 Camaro sound better. He was amazing! He walked me through all my options while giving me the pros and cons. I went with his suggestion and my car sounds absolutely perfect. Better yet, his suggestion was the least expensive. Another shop would have sold me a much more expensive exhaust system. I probably saved $600. THANKS JR!

Best place to get any exhaust work done in the Inland Empire. The owner treats every job as though it was his car. We had two chrome tips put on. He was meticulous about how they looked. I highly recommend this shop. I will bring my other cars here as well.

I brought a brand new Dodge Ram 1500 Hemi and wanted to hear the engine more from my muffler. I had never been here before and called and spoke directly to the owner. He was welcoming and spoke to me like I had already been coming there for years. The location is something of a treasure hunt. But trust me its worth it. The mechanic who worked on truck was so amazing. He was so through with my truck making sure I knew all my options. All together the entire process was fast and exactly the sound I was looking for from my engine. I am already planning on coming back to get a new set of tips and whatever else they want to sell me because its quality work at a great price.

Came here last week needed a exhaust leak fixed. As soon as I get there guy comes out and says they can’t fix it because some guy that went there the day before had the same wheels as me and they couldn’t load it on the lift. Doesn’t make sense don’t think they care about business another person in front of me also got denied service for similar reason. Lazy shop 0 stars if could

Went in to just get a spring bolt replaced, He had to drill out what was left of the bolt that broke and ended up stripping the threads. So we went to plan B which was to weld the header to the cat. 12 hours doesn’t even go by and ends up breaking the weld.... Went back this morning to get a refund and was accepted. Very good customer service but in my opionon, lack of experience:/ Went to another shop and was fixed very quickly and now have no issues with the exhaust.

Very fast and friendly. Jr. Gave us different options with the different price and knew how to tell use the difference in each product. I would definitely recommend this place and will come back

JR is an awesome business owner! We initially spoke on the phone and set up a time for him to look at my Jeep. Hes a really straight forward and honest man. Would recommend him to everyone! Thrilled with my experience! Thanks JR!

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!

Awesome people here, I had a downpipe issue didn’t know what is was but in less then five minute they had me up and running again. Won’t go anywhere else next time

RED FLAG - BEWARE OF THIS GUY. DONT DO BUSINESS HERE. RIP OFF! 0 STARS

Excellent customer service.

Best muffler shop I have been to they hooked me up with a good price for a new cat and muffler the beat the price of all the other muffler shops I recommend coming to this shop. awesome service. five star

I was recently in the market for an exhaust system upgrade for my car. I called just about everybody in Temecula and everybody in the city must have been upgrading their system on the same day because nobody could touch my car for anywhere from 2 days to as much as 2 weeks out. Thankfully I found Autocross Performance on google and gave them a call. Not only were they happy to make time to fit me in that day but their price was much lower than anywhere else that I called. Hands down best experience that I have ever had with an exhaust upgrade and a real pleasure for me to meet JR and his staff. HIGHLY recommend them to anybody that is in the market.

This morning, I took my husbands Toyota 4runner for service...So far Im really pleased with the way I was helped. I think it was the owner who helped me. He gave me 3 options to choose from and explained everything to me step by step.

Called JR up to have a new muffler put on my 1991 Acura Integra, he effortlessly helped me find the exact sound AND muffler design I was looking for. Needless to say I am more than satisfied with the service, quality of work and friendly service. I would recommend this shop to anyone looking for exhaust systems or custom fabrication. Thanks for the good work JR!

These guys are top notch and a true blessing. This is my second trip here and everytime its the same great smiles, service and quality. I highly recommend them. Talk with J.R.. he is the best

J.R is really great answering questions and helping you figure out what is best for your car, Im really satisfied with his work and the sound of my car and the price is unbeatable, I would highly recommend this shop to anyone who wants to get work from him done. Thanks J.R. for your high quality work.

Awesome guy, I had a vision of my exhuast setup and before i knew it you guys did EXACTLY what i wanted, great customer service too, super nice and knowledgeable, will see me again!!!

Trustworthy guy and great service! I would recommend you try this place out

Explained every step of the way and gave me awesome recommendations at an unbeatable price. Wont be going anywhere else from now on.

This is the best shop I think Ive ever been to. This shop is here for you and not the other way around ... I worked with J.R and he definitely goes the extra way to help

My muffler was corroded and I called Autocross Muffler. Eddie told me the price and how long it would take to replace over the phone. I had called some national chains and they quoted around $360, and the price here was less than half that.He explained how they sometimes use used parts and asked if that was ok. I went over, he showed me the part beforehand. The replacement muffler had come from a new car that the owner wanted to replace its muffler with a performance muffler, so it was a like-new part. Everything went as described and it was fixed in no time! Thank you Eddie and Autocross!

Awsome prices and explained verry well no regrets

Awesome place to go to if you dont know what u want or what kind of sound they will help you the owner and Eddie were some awesome guys will help you with your buget you are working with and they are very truthful guys

Owner helped me out no problems very happy with the job I got done !

AUTOCROSS MUFFLER DID A GREAT JOB ON MY 1998 MITSUBISHI,, 4 X 4, SUV....RUDY WENT THE WHOLE 9 YARDS ON A SUV THAT NEEDED A GREAT DEAL OF LOVING CARE,,,,,,,,,THEY WENT OUT OF THERE WAY TO SEE THAT THE HARD TO GET PARTS WERE IN THE HOUSE........AS A TEAM J R.....AND RUDY DID AN OUTSTANDING JOB...AND MY SMOG PASSED..........MANY THANKS AGAIN.......ROB GRUEN,SUN CITY,CA.

Verry friendly . Greater prices and professional service

The owner is a very nice, respectable, and all around good reasonable guy gave me good advice about my 350z and would definitely trust and recommend him when it comes to a exhaust for your vehicle

Had my exhauat done there, sounds absolutely phenomenal, highly recommend taking your car there for any of your automotive needs.

I went to autocross today and had a flowmaster put on my honda accord and my flex pike replaced. The job was done right the price was right and my honda was tight. My brother in law drop me off so I can pick up my car and he decided to have them put one on his mustang and we both left there with a smile on our face. These guys know what they doing and fast. I highly recommend this shop.

Great guy, professional work!

Honest, Friendly good people!