21st Century Muscle Cars

These guys are top notch! I recently rebuilt my LS1 in my 98 Trans am with more power in mind but keeping it N/A. Talked to John originally and he got me in within a week to dyno tune my ride. Matt is a wiz with the tune with over a couple of decades experience. I cannot thank these guys enough! Great people, great shop! These guys are legit!

Had these guys install some borla mufflers onto my GS. They installed the mufflers, fixed a problem the previous shop caused, and lined everything up perfectly. They work on some higher end projects as well. Great shop. Great prices too.

Matt and John made the transaction super easy. Did the DOD delete on my Tahoe. Matt kept me posted on vehicle during the small delta of time it took. It is super easy and in and out less 4 days.
Is worth the cost, yes the vehicle runs better and shifts smoothly. It's not jerking anymore from 4 to 8.
I have used 21 Century services on my Corvette 10 years ago with perfect results.
Only thing wish did this much sooner. Thank you.

21st CMC is the ONLY shop I will allow to touch my cars. They built my CTS-V and now work on my Z06.

My CTSV never gave me one problem in 5 years. Matt's tune was spot on and ran hard.

They deliever as promised when they say they will and the bill is always what they quote me for a job. That is very rare in the performance industry.

Matt's customer service has always been excellent. He's honest and will shoot you straight. Most shops will push hard to get you to buy parts you dont need to just run up the bill and Matt/21stCMC NEVER does that. They are my go to shop and no one else will work on my toys. Thanks 21STCMC!

I would highly recommend 21stcenturymusclecars! I choose 21st for many positive and very important reasons to add mods to my 2014 Camaro. I as anyone am a muscle car and automobile enthusiast and love cars. I wanted a long time, professional, know what they are doing shop to add the mods to my Camaro. Therefore, I choose 21stcentury purchasing the 550-horsepower package. I also inquired about cold air intake upgrades, gauge packages and was provided detailed knowledgeable answers to my questions. Knowing these shops and guys know their stuff as they do this for a living. Not once from any shop let alone from 21stcentury did I feel as if they were condescending or snarky toward me with my questions and their response, particularly Matt at 21stcentury. Knowing Matt probably gets asked some of the basic questions daily in and out always responding to me in a timely manner, to which, I never felt as if he was in a hurry or felt like I was “bothering him” with my questions.

I am by no means an expert when it comes to upgrading or working on cars adding modifications. However, I do know a little bit about the process and name brands so forth so on. I also did my due diligence/research on many top shops around the DFW area inquiring on what their recommendations where to add horsepower/torque while maintaining reliability and drivability
Matt and I am sure his team are very professional, helpful & had great prices. Solid service. I was informed about a potential bottle neck during the dyno portion of the process and was provided a reasonable and effective way to overcome the issue. My automatic 2014 Camaro SS with the stock L99 engine probably dynos at about 320 rwhp. With the awesome mods that 21stcentury performed my car is now getting 446rwhp and 417 rwtq. Great numbers! I will come back to the shop for any future mods.

I brought my ‘02 Z06 to the team at Twenty First Century Muscle Cars for an overall inspection and a fresh tune after I bought the car. The team here was great to work with and the car runs amazing! Coming from old-school muscle cars this was my first LS based car and this team will be getting more of my business in the future.

BEST PERFORMANCE SHOP! Been going to this shop for some time now, and they are always great. Dropped my car off last year for some fuel injector issues, car was fixed in less than 24hrs. My aftermarket fuel pump went out and I called Matt and had it ready for me the next day along with a new fuel pressure gauge! Beyond happy with the quality of work and how it’s done in a timely manner. Highly recommend checking them out! Thanks guys!

Phenomenal customer service, if you care about your ride. These guys are the go-to shop, quick, affordable and extremely knowledgeable. I’ll never take my car anywhere else! Thanks again Matt!

Great sevice and great work. Had headers and a tune done on my 2019 Camaro SS and I will be coming back for more work.

This is the best place for excellent work, great customer service, and very knowledgeable staff. I Got the supercharger package for my C7 Vette and could not be more satisfied with the professionalism and performance. I will be back!!

Awesome place, Matt is such a great person to link up with if you ever need anything.
Very straight forward guy that gives you honesty and you can tell he is a very genuine guy, highly recommend this performance shop.

Have had the following work completed by 21st CMC on my 2008 Z06: H/C/I, headers, 102 throttle, Mamo and Corsa exhaust. Matt and John are both extremely knowledgeable, professional, and are always willing to take the time to educate the customer (even when I don’t ask the most intelligent questions). Your car will be returned to you in a timely manner and the workmanship is the highest quality that I’m aware of in DFW.

All the positive reviews are spot on. Matt and the team get down to business. I brought in a Corvette that had been sitting in a garage for years, knowing that it was going to need quite a bit of work. The team took the car in on a Saturday morning to give it a detailed inspection and produced a list of the items that needed to be addressed. I set my expectations that there would be a bit of work, and there was. During and after completion of their work, Matt told me about other things needing to be done, that they did not do. Point being, they know you want your car in great shape, and they don't try to do things they are not amazing at or have chosen to be, yet (e.g. tires, alignments). The car is running like it was just pulled off the showroom floor ... and it's a 2003 Corvette!

I was referred to 21st Century Muscle Cars for a problem with the shifter in my 1999 FRC. I met with Matt, and he immediately knew exactly what problem I was having after being there only a few minutes, and told me exactly how to fix it myself. They could’ve easily taken the car in the shop and done the work themselves, but knowing that this issue is common, they gave me the information and sold me the parts I needed to fix it myself in about 30 minutes. I highly recommend that if you need any work done on any of your late model performance cars, that you call Matt at 21st Century. Thanks again Matt!!!

Matt and John were awesome upgrading our 2010 Camaro SS with a cam changeout, header install, and DOD delete. Everything they said they did, and they explain the process and what to expect.

Can't recommend these guys enough!

These guys are awesome. They do a great job and they are super friendly and knowledgeable. It's the only place I'll take my performance car. The only "problem" is that they are so good at what they do there is sometimes a bit of a wait to get on the schedule. But that's also how you know they do great work. All these positive reviews can't be wrong.

This is a great place, dropped car to get cam package, told me about 4 days, I expected about 10 days, car was done in 2.5 days, when I picked it up it was as expected and car was taken care of, very impressed! Thanks Matt

I will only bring my GTO to 21st!!! The team here is awesome 👌 Matt is fantastic to work with & very knowledgeable about his work! Had my GTO's headers, midpipes, exhausts done here 6 years ago then decided to get it cammed in 2019, don't regret any of the work one bit! Also had a CTS-V bbk installed 6 piston on the front 4 piston on the rear!Amazing shop, great performance upgrades

These guys are top notch! Only the best things to say about the work they've done to my C7 Stingray, great quality of work and service, and super knowledgeable on future upgrade I plan to do. Definitely recommend them to anyone interested in performance upgrades and will continue to do more in time to come. Shout out to Matt for the great work he did on my headers and tune!

Wanted to share my experience with Matt and 21st century. They installed a cam package on my 17 SS 1LE and it's exactly what I was hoping for in terms of power and reliability. Everything was scheduled and handled properly and the project was completed in the time frame I was given. After about 1k miles after the installation, I had an issue with my coolant leaking which we found out was a connecting clip near my radiator that had failed. Matt took care of the issue for me and also fixed a small rattle I had in my exhaust by adjusting it slightly. I think these guys are top notch and stand behind their product, I would highly recommend Matt and 21st Century.