I had a shop do it, Eastside Motoring in Waltham, MA. They do a lot of high end work and I've always had good results with them. In fact, they just installed my Stillen Gen 3 CAI.
Replacing the stock cats with HFC drives up the labor cost. If it had just been the catback exhaust, it probably would have taken an hour. Getting at the bolts for the cats turned it into a 2.5 hour job. It cost around $375 for the total install.
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