I don’t want to get the magnaflow catback or any catback and run into fitment issues or have a hassle.
I had a local shop put a Flowmaster (can’t remember the series) on my truck when it was new because I couldn’t hear the OE to shift. A few years ago, I replaced all of that with the Magnaflow cat-back. As far as fitment, it was great. I should have a thread somewhere on it, but installation was a breeze. The only oddity I remember was that the muffler had two hangers on it and my OE only used one. I don’t know if this is a 6 cyl vice 4 cyl thing, but I had the threaded holes in the frame for a second hanger which I picked up from my local Nissan dealership and everything lined up perfectly. I am 99% sure that the OE piping was smaller than the Magnaflow diameter and that the Magnaflow matched the diameter for the OE pipe “cat forward”.
All that said, I don’t think you’ll find the Magnaflow as “throaty” as the Flowmaster. You’re best bet may be trying to talk your local guy (or someone else) into building a custom system for you.
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