Best place got my tune and performance mods to my supercharged mustang Bullitt Price is reasonable and quality work very happy

Alex is legit, very professional and knowledgeable, he gets it when it comes to modifying and improving sports cars. I’ve had a great experience modifying and boosting my 2018 Mustang. Would recommend for sure.

Alex was really professional very kind and explained everything to me. He gave a lot of horsepower and a lot of torque to my car. And he told me what I can do to my caR to give it more power. The price was perfect.

Alex and the team at GSD are where you want to take your car if you want them to treat it as if it was there own. I dont think there is anything Alex doesnt know when it comes to cars, if so I want to know! Hes a straight shooter and will tell you exactly whats going on, whether you want to hear it or not. No hiding things or shortcuts on his watch. Highly recommend checking out his shop. Skeptical? Talk to him for 5 minutes and youll be convinced otherwise. Knowledge is power, and power gets put to the wheels here!!

I brought my Hellcat to Alex to have a few kids done and some tuning. And once again he did a fantastic job! Great guy to deal with. He’s 2 1/2 hours away from me and I wouldn’t take my car anywhere else! Thanks Alex!!

Amazing place. Very knowledgable.

This shop does top notch work and are great. Theyve been helping me restore my fathers 1968 Chevy Corvette, and they were immensely helpful in first getting it up and working right. They have had very detailed notes and tons of useful information. Worth every penny and then some over a traditional shop!I just scheduled the next round of work on the Corvette, and will probably only bring it to them from here on out. I highly recommend this shop.

We drove several hours and brought Alex a car that we knew very little about, as we had bought it at auction. True typical fashion, things didnt go exactly as planned and he ended up chasing a turbo gremlin. Much to our surprise, he went above and beyond and helped us out in a big way getting everything straightened out; and he made it all look like it was no big deal. We will never be able to thank him enough for the excellent work and great customer service. We will be return customers!

I just bought a 2018 Ford GT 350 and sent an email about getting a tune and added power. Told them they probably have better ideas than me and was open to whatever they wanted to do...no reply. Since it appears I missed two emails I will try to locate them. Thank you for getting back to me. I have changed the rating.Update, I am a big enough man to admit my mistake. I used the wrong word in part of my email address, I have several but its no excuse. Thank you for reaching out and the review is 5 stars for you guys and 1 star for me.lol lifes too short to not admit when your wrong and laugh at yourself. If you have any ideas on packages to make my gt 350 more powerful, I am all ears. Thanks

I called in and spoke to James. He told me to come in and explained my entire personal situation and in fixing my car. He recommended me what to do the the moment and what was able to wait if it was him. James is not about taking money from people but making sure his customers are getting done what is actually needed. I got lucky since I walked in at a perfect time. My car was seen and work was completed within 5 hours or so. It feels sooooooooo good to have my car back on the road and it wouldnt of happened if it was for James and his co-worker. GREAT JOB!!!! Go see Granite State Motor Works and they will take care of you very good!!!

Rick @ Granite State Dyno is amazing! Anytime I send him one of my customers looking for tuning or upgrades, he knocks it out of the park! Top notch work, done honestly, at a fair price.Best Regards,Kenny G. MacMulkin Chevrolet Corvette Service Team

Awesome and honest shop, one of the few I trust to work on my cars.

I called the shop for a cat less down pipe install estimate. They gave me 650 $ and 1 day of labor time. I asked around other euro tuning shops in mass. Their price is 150-200$ and 2-3 hours. I went to mass and got it installed: it was no longer than 3 hours. Please dont rip people off with crazy expensive labor price.

Sent my girlfriends car for a total car detail. This place works magic!!!! The car looked better after the detail than it did when we picked it up from the dealership! Looks brand new and they removed stains that we thought were never going to come out! HIGHLY RECOMMEND THIS PLACE FOR DETAILING! Will never go else where!

Always have had good experiences here. Alex is the best. Ive had my motor built here, paint done and had my car tuned.

As long as Dana is still there, I would avoid this place like the plague. He is just untrustworthy. He has a whole pocket full​ of excuses. Theres a reason his former shop on the same property went out of business. All the quality employees left him and the place went downhill quick after that.

Been going to this place every year with all my vehicles for inspections. This year I have called with no answer, finally got someone who took my info and said someone will call and never did. Called again and same thing happened, when told about my issue said we could probably see you by the end of next week. She was dismissive and not interested in taking my business. Never had this kind of service from them before.

Emailed the tuning side of granite state dyno, no email back!! Called and was told he was tuning a car but would call me back. Imagine my surprise when i got no phone call back. Seems to be that performance shops in the NH area only cater to certain individuals.

Awsome experience. Very professional very friendly. Helpful with all questions . Would recommend to anyone. Thanks guys.

Great job installing a clutch in my nephews 2006 Evo and then tuning it to get 75 extra HP at the wheels while he was away in the Army.

Granite State dyno is the best around. The owner and tuner Alex is amazing when it comes to diagnosing and tuning your car. I rebuilt my Altima V6 engine with high compression pistons, big cams and a handful of other things. I took the car to two other places around, the first guy said the car couldnt be tuned and the second place told me that my engine was Fd up and it may never run. Alex got the car running and on the Dyno the first morning he had the car, then spent 2 days making it perfect. Then just today I had a n issue with the car, brought it by and Alex had it figured out in a 5 min test drive.If you need your car done and done right, dont waste any time going somewhere else. Go strait to Granite State Dyno

Granite State has been awesome so far. All my dealings with them have been on the level and I look forward to dealing with them some more!

For what its worth, I brought my sons car in to have the engine put back in his Subaru WRX.I asked is this something they would be able to do. They said No Problem.They had a few cars ahead of me but they would be able to do it. Well, one thing after another and 3 months later I was getting the run around. I was told that they had a surge in business and they had purchased another building and hired 2 additional techs. I started calling everyday and would get a new excuse everyday. So finally Im told the car is ready and a bill of $2,200. My sons drives off to work and then goes to start the car after work and the battery cable were not tightened to the battery terminal. He went back the next day and needs to have new cables put on for additional money. In the mean time he has a error code reading a leak in the turbo system. We purchase a up pipe to take care of this problem that did not fix the problem. Now when I call Im getting the new secretary and ever one is busy. I was told the car would be put on the dyno to identify the problem and get it fixed because he would not get a sticker with this code. The car should have never been given back to me with out being put on the dyno and done right.I had to take the car down the road to Pro Vision who work on Subaru.They found the leak in an hour and had in fixed with short money.These are the kind of business practices that give auto mechanics a bad name. Granite state has gotten to big to fast and can not be everything to everybody. Either you cater to the day to day drivers and take the time and fix there autos properly. Or strictly focus on performance enhancements.They have lost there vision and the product that is coming out of there is unsatisfactory. So as a consumer you need not make the same mistake as I did and trust someone who says we can do that maybe at one time they could, but thats not were the money is at. Its at the performance level. If you have the money to burn you will get the attention you desire.Good Luck.

Great service only ones that touch any of my cars. Wont go past them.

Dana and Jon at Granite State Dyno are consummate professionals. Ive had my stroked and supercharged Challenger SRT8 at their shop on several occasions to get all forms of performance upgrade installed: A/F and boost gauges, SPEC racing clutch, front main seal upgrade, dyno tuning, etc. The work is top notch and the interim feedback on progress and completion really leave you feeling confident.These are my Go To Guys for upgrades and maintenance to my big, bad HEMI.

The best place in the area for performance work!

Alex and the team at GSD&T are true professionals. Ive had my car dynod there multiple times. They have an AWD dyno. Im an insurance agent and have received very positive feedback from customers that have had their cars repaired there.

Very honest and professional.

Horrible service..waiting and waiting...sent 20 emails, called 10 times and was told he will call me back, never did...response to response...I want to believe you but all the other negative feedback says the same thing...mayb e you should check your staff out or maybe offer your personal cell phone for better communications

Cannot for the life of me get in touch with this place, they never pick up the phone and i have tried all lines.. guess ill find someone with actual customer service

Upgraded and fixed my clutch,upgraded my flywheel,saved $550 by converting my flywheel to aftermarket

Horrible customer service. Treated me like I was subhuman. I would never recommend this place.

Fantastic mechanics with extensive experience

Avoid granite state motor works

Twin Turbos!

Cool toys here

Friendly courteous service

Great shop , helpful staff,, awesome prices !!!!

The best around for sure !!!!!!!