NOTICE

*Temp phone #s

972-685-3138

972-685-3139

972-685-3140

The shop phone number is currently not working, (3rd day without service!!)

We called to upgrade our internet and TV services with Spectrum and the customer service rep “accidentally” removed our main phone number/972-417-7177 that we have had for 24+ years!

After 10+ phone calls to Spectrum as well as 3 different techs, our main phone number of 24+ years is still not working!!

Sorry for the trouble

Your Performance Specialist

Located in Addison Texas, 21st Century Muscle Cars is your one stop shop for modern automotive performance modifications.

Welcome To 21st Century Muscle Cars

For over 24 years, 21st Century Muscle Cars has exceeded the automotive needs of customers throughout the United States. Located in Addison Texas, we are a full service automotive shop specializing in aftermarket modifications and repair for late model automobiles.

We offer Performance Packages from mild to wild including 1500+ Horsepower Track Monsters. Regardless of your performance goals, we can help you realize your vision and build your dream car.

Contact our shop today to discuss your project. We welcome the opportunity to educate you of your options and earn your business!

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Texas Leader In Late Model Automotive Performance

Performance Packages

At 21st Century Muscle Cars, we offer a wide array of performance package offerings for today’s late model high-performance automobiles. These customizable packages are proven to meet or exceed our customer’s goals.

650 HORSEPOWER SUPERCHARGED 2019-2025 GM & Cadillac SUVs

Get $2,000 off this amazing package!
Includes PCM unlock, tuning and installation.

LIST! $16,950
SALE! $14,950

Client Testimonials

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.

Rick Romero

Matt and the crew are amongst the best around. Straight forward and they stand by their work. For performance, they’re the only team I go to.

Kevin Bernard

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!

Matt

Matt is great to work with. Very knowledgeable and responsive to my many questions around superchargers, exhausts, and shifters for my C5 Corvette. 21st installed an MGW shifter and Borla exhaust for me, and I couldn’t be happier with the performance and turnaround time for the work to get done! These guys are good.

Nic H.

The shop has done work on Vettes for me as well as dyno tunes and all was aewsome! High end work! They know muscle and especially late model hot rods.

Tom C.

John, Matt, and team are pros! Gave me a great deal on CAI install and performance tune for my 2016 Corvette Stingray Z51, and finished it in the time quoted. Got a solid quote and detail explanation on LTH and xpipe upgrades for later, and will have them do it the moment I can (wife approval pending lol).

Don’t hesitate to use them for any of your domestic performance upgrade needs!

Richard S.

Thanks to the guys at 21st for getting me out of a jam! On Friday evening I get in my Z06 and here a whirring noise and no clicking. The car was starting and I thought the bendex spring was dead or the starter was dead. We tried to push start it but it wouldn’t and my fears grew that my beautiful Z06 had just committed suicide! I called 21st 5 minutes on Friday before they closed and asked if I could tow it over and leave the car with them. They agree and said they’d get to it as fast as they could. I was a bit caught off guard when I got the phone call Monday morning that my car was done and ready to be picked up! It was, in fact, a starter, they changed the oil, and gave the car a once over. Talk about service! 5 minutes before closing on Friday they take the call and on Monday it was ready to go! Thank you 21st you’ve turned me into a customer for life.

MJ L.

John and Matt are definetely top notch people. I’ve used them for 7 years with my C6 Corvette and have been extremely happy. Now I’ll be turning to them for my new C7 Z06.

Bob S.

Awesome shop. Got my exhaust installed on my c7 stingray in less than 2 hours and it was done perfect. Keep in mind I don’t trust anyone working on my car so when I say the work was perfect I mean it. Don’t take your ride anywhere else, this is the place to go to. Honest people and fair prices. Any future upgrades I know where I’m going.

Juan S.

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!