I was looking through some old posts on here and found that a granprix cat back system (borla, magnaflow, slp....) will fit the bonnevilles? Now im not planning on this since I already have my exhaust setup, but I was just curious to hear if it really did. For some reason im not thinking the bends line up right or would be long enough in total length that matter. I will try to but a link to thread later...

Nope, the piping from the cat to the Y is bent different