I've had the same problem in the past, I always had to install myself. It's why my Z is still stock cats.
I had exhaust authority install my catback and really liked them, good rates. Worth asking them, but I doubt it. You try all the usual performance shops? I imagine SOMEONE will do it, but you're probably looking at a few hundo for it. You may have better luck if you ask in person with cash on hand.
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