Don't use Lou's Custom Exhaust, they've ripped my g/f off twice. There's a reason the one in Fitchburg closed up shop and Mario's next door is busy as hell, she wasn't the only one ripped off. Can't really help you with Southern Mass but I don't generally trust Lou's anymore. And she was screwed by them in Fitchburg and Worcester, not just one of the shops. That's why it was twice, was hoping for better workmanship at a different one. They replaced sections that weren't bad, did lousy welds, and didn't tell her they were doing extra work and charging more for it. Her 94 Honda Accord still sounds louder than my buddy's PowerStroke diesel.