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I think there is a misunderstanding with the whole testpipe raspy issue. I want to comment based on my experience over the last 2 years. I have had a few different exhaust setups with various results.
Ill start out with a simple list of the setups and the resulting raspiness, etc.. All setups were done on the stock exhaust and only headers/cats/ypipe were changed. (headers and borla were on friends' cars)
Stock headers --- Non-Resonated Test Pipes ---Stock Y-Pipe --- Rasp = Yes
Stock headers --- Resonated Test Pipes --- Stock Y-Pipe --- Rasp = No
Stock headers --- Resonated Test Pipes --- Aftermarket Y-Pipe --- Rasp = Yes
Aftermarket headers welded to test pipes --- Non-Resonated Test Pipes --- Aftermarket Y-Pipe --- Rasp = No
(exception is this setup with the Borla dual)
Stock headers --- Resonated Test Pipes --- Borla Dual --- Rasp = No
If you look over this list carefully it seems that the test pipes are not necessarily the cause of the raspiness. I believe it is a mis-match between pipes bolted together. When i had my exhaust taken apart, I noted that all the pipe inside diameters were of different sizes. I put the resonated test pipes on and had zero rasp. I then added an aftermarket y-pipe and the rasp was there just as bad as if I had non-resonated pipes..
Maybe some others can post their experience. But i think i covered enough variations to show what the problem is..
Ill start out with a simple list of the setups and the resulting raspiness, etc.. All setups were done on the stock exhaust and only headers/cats/ypipe were changed. (headers and borla were on friends' cars)
Stock headers --- Non-Resonated Test Pipes ---Stock Y-Pipe --- Rasp = Yes
Stock headers --- Resonated Test Pipes --- Stock Y-Pipe --- Rasp = No
Stock headers --- Resonated Test Pipes --- Aftermarket Y-Pipe --- Rasp = Yes
Aftermarket headers welded to test pipes --- Non-Resonated Test Pipes --- Aftermarket Y-Pipe --- Rasp = No
(exception is this setup with the Borla dual)
Stock headers --- Resonated Test Pipes --- Borla Dual --- Rasp = No
If you look over this list carefully it seems that the test pipes are not necessarily the cause of the raspiness. I believe it is a mis-match between pipes bolted together. When i had my exhaust taken apart, I noted that all the pipe inside diameters were of different sizes. I put the resonated test pipes on and had zero rasp. I then added an aftermarket y-pipe and the rasp was there just as bad as if I had non-resonated pipes..
Maybe some others can post their experience. But i think i covered enough variations to show what the problem is..