Highly recommend. JTM did a cam swap and a dyno tune on my El Camino with a 5.3 LS and I couldnt be happier with the results. Jon rules and gives exceptional customer service. When I changed my rear gear ratio he walked me through updating my computer so I didnt have to drive two hours back to his shop. First class operation.

John and the team at JTM are the best. I took my car there first for basic maintenance and got the grand tour of the facility and it’s very high tech. They have all new lifts and equipment and do dyno tuning onsite. He spent a lot of time trying to find a problem with my car and kept me well informed every step of the way and even provided advice about next steps. His shop rates are the most reasonable around. If you’re looking to get your sports car worked on I would definitely recommend JTM.

If you are looking for any LS or LT or for that matter any parts Chaz is the best guy to deal with hands down!.. im in canada and its usually horrible to get anything shipped here or even priced here at a reasonable price and Chaz shipped me my stainless works headers and rotofab intank (and some more stuff soon) and saved almost $600Us just on parts and his shipping quotes were amamzing for shipping to canada and my stuff arrived in a week even with christmas.. will definaly use him for any aftermarket parts regardless or make of vehicle he can get them.. thanks again!

First Class Operation! It is the right place to bring your Vette or muscle car. John takes the time to explain all and does it right. Staff is highly trained. These guys get it done. I highly recommend.

Brought my car to have work done.after months of hardly no communication only when they broke something. Now I have a car with a bad tune and have not heard back from jtm. Horrible communication does not care about what the customer wants! John tells me he will call me to get the car back to him to fix it, but thats been a lie. The only people leaving positive reviews are his friends! Now I have to pay another shop to fix JTMS mistakes. Avoid this shop!

Hands down the best LS shop on LI. Friendly staff, very knowledgeable, and fair pricing. I would recommend JTM to everyone. Thanks again!!

Ngl but this is one of the best tuning shop out there

John and entire staff at JTM did an amazing Job! These guys are the real deal!

Great people with great knowledge cant wait to get mu car in

Went in to get some work fixed that another speed shop messed up on me, really great group of guys. Handled the issues and my vette is running great again. Will definitely be coming to these guys for all my future work coming

Hands down the best performance and fabrication shop in the Tristate/Longisland area. Driving onto the lot alone you seen nothing but amazing builds in progress or completed. These are the guys you bring your vehicle to when your looking to make your street car or race car the fastest possible. Happy to have found John/Matt to turn my Trailblazer SS into one of the baddest street trucks around.

Very nice person John the owner. Very professional shop and services. Definitely the place to go for performance needs on your ride

Great guys, built my dream vehicle from scratch. Runs like a dream.

TLDR: These guys are amazing, they are upfront and did an excellent job on my Fbody when no one else could.Long: I purchased a 2002 Camaro SS SLP, after a while the car had the following mods, G5x3 cam, clutch, exhaust, suspension, intake etc. I had taken it to a few other LS tuner shops in the NY area and no one could really tune the car. I really could not drive the car, the oil smelled like gas, it would fall on its face when you go on it, and I didn’t know what to do or where to go. Someone recommended JTM and I said well screw it, I might as well try. Today I picked up my car, what an amazing difference. The car is running, no sputtering, and no issues at all. I was given a printout of the dyno numbers from a Mustang dyno, the guys in the shop were friendly and did not bust your chops. I have been to other shops and if you don’t have a supercharger, turbos, or an aftermarket ECU they don’t want to deal with you. The other shops told me Without an aftermarket ecu this car will never work with this cam Not these guys, they took my car, made me feel comfortable and were transparent though the hole process. I wish I can give these guys more than 5 stars. They have earned my business for life.ThanksA very happy 4th gen Camaro owner.

Great guys and do a great job on my buddies joe constellanos car and shows great workmanship even though i never done bussiness with jtm maybe some day

Very very happy with John and Matt very courteous knowledgeable and professional will definitely be back for more mod work on my SS1LE

Great performance work done here for LS cars

The best Vette shop in Long island

After going through a nightmare with another shop John offered to help and now the car performs great and I couldn’t be happier

John at JTM gave me excellent service.

Save yourself the headache and your money.Excuses and more excuses....

Friendly staff