I worked in Nashua for a year a few years back but unfortunately I do not know any mechanics in the area at all.
Closest car guy I know is a parts counter guy who left Saturn and is now at Town Fair Tire or Tire Warehouse. I get the 2 mixed up sometimes.
I think I can ask someone but it might take a few days for a reply.
Name: WildCards Performance/Automotive
City/State: Hooksett NH (5 minutes off exit 1, rt. 101) 15 minutes from center of Manchester, 45 minutes north of Boston
Person:Brian Rice, Owner. Keith Lodge, Mechanic
Website(N/A): WildCards Performance
Comments: Great shop for not only performance, suspension, brakes, cars, trucks, motorcycles, and even ATVs, WildCards now does NH State inspections, Oil Changes, vinyl decals, T-shirt/sweatshirt screen printing.
Brain and Keith have their share of Car/Truck/Motorcycle performance background, and are always looking for new projects. I take my car there for all the big projects i need done in a hurry, as well as my motorcycle. These guys are knowledgeable, know what theyre doing, and will tell you how it is and why straight up. Check them out at their website for more info.