603 Performance and Maintenance LLC 527 Mammoth Road, Londonderry, NH 03053

"After a long anticipated wait. I had 603 performances instal a iag long block recently. Absolutely the best small performance shop in the area. After using other local shops I hv really enjoyed what they did and how they talked about everything before doing it ther quoat was reasonable better then others in the area by a lot. Recently I went there for oil change they noticed a ball joint loose they didn’t even bat an eye took care of it this is top notch business. So I would recommend anyone that ownes a Subaru or other models to take it there. Now I recently needed it tuned they set me up w Matt miner for the tune omg I hv had local shops tune my car in the past but nothing as smooth or power range I was looking to achieve. Matt proved to me today why he has such a great following and loyal clientele. I hv never drove a more responsive Subaru. Hats off to you Matt miner. Just thought I would share my experience with these top notch businesses. These three guys are truly most knowledgeable in there industry then most."

"I would highly recommend 603 performance. Amazing business pat was an amazing help for my daughters first car. After we bought it we new it needed some work we had brought it to 603 after a call over the phone with Pat. Amazing customer service amazing service would 100% recommend this businesses for everything with your car needs. They are truly amazing. Thank you, 603 performance!"

"I have been to 603 Performance several times for varying issues with my STI, Pat & Jeremy always do great work & work very quickly! They've been able to get me back up & running & on the road in a matter of minutes each time. I would highly recommend servicing & maintenance here, especially for a Subaru."

"I consider the team at 603 as a "go to" when I am thinking about what I want to accomplish with a build. They're open and honest about what can be accomplished and have always given me excellent service when I've got work with them. They're responsive and kind - I would recommend them to anyone looking to enhance or maintain their rides!"

"Pat and Jeremy have been my go-to mechanics ever since I discovered 603 Performance 4-5 years ago. I had an issue with my old Subie not starting in very cold weather for like 2 years. Multiple mechanics had me replace different parts and nothing worked. I missed work and a vacation trip because of it. When I found Pat he finally solved my problem, and I’ve relied on 603 ever since. I bought a brand new Subaru in 2020 and I’ve never been back to the dealer. Pat and Jeremy do all my services; everything is 100% by the book and they do not skimp on parts. Prices are very fair, I get better quality work than my dealership, and I never feel pressured. It can be hard to find a good, trustworthy mechanic. I don’t care if my next vehicle is an F150, Pat’s my guy."