I have been debating going to Lou's Custom Exhaust. People have recommended them to me and I stopped by the shop one time and talked to them. The seemed like reasonable guys. The one in Boston is off of Mass. Ave after Melinea Cas heading towards South bay.
Watch out for Lou's. The one in brockton is well known for being hacks. They weld everything together. Tailpipes, mufflers, midpipes and h pipes. Anyone should be able to do it for you.
Yup, i've heard the Lou's in N. Reading is the best one to go to.
I've also seen a hack job by another unnamed muffler shop. From headers back they welded up everything. We went to drop the tranny on my friend's 5.0 2 weeks later and found everything welded. We had to take a sawzall to a 2-week old exhaust job.
I went to Lou's in Brockton. Had no problem, they bolted on my O/R x-pipe then i went back for stage 2 flows and 3in tips. They did a sick job, I got one of the loudest cars in my town.