That is pipe diameter. I thin most of the aftermarket Y-Pipes are designed to work with an aftermarket y-back exhaust system.what size is the stock exhaust after the y pipe and they say 2.5 inch inlet to a 3 in out let is 3inch the size of the pipe or flange? cause i have not seen 2.5 to 2.5 y pipes.
Resonated test pipes will not always stop the rasp. It is the overall combination of exhaust components. As soon as i installed an aftermarket y-pipe the rasp was very bad. Took it off and it went away. (this is with kinetix resonated test pipes) Rasp was not there with borla either.I think if theres one mod that people complain most about causing rasp, its test pipes, especially poorly resonated ones. Stick with well-resonated test pipes or high-flow cats, and you should be ok.
Not to jack your thread but has anyone tried 2.25 inch resonated test pipes with the Kinetix 2.25 -2.5 inch y-pipe? If the theory on piping diameter and rasp is correct then this should minimize whatever effect that has. I'm assuming of course that the inlet of the stock midpipe is 2.5 inch. Is that correct?
I have the SSV and it is not Junk..