When I got my FI exhaust I put it on before I swapped the test pipes for headers and it completely eliminated the rattle. The stillen exhaust combined with any type of cat removal is garbage. There is absolutely zero rasp/rattle with the 12" resonators, however I was upset because I thought it was going to be louder. Now I have long tube headers and I just bought a non resonated X pipe because the 12" is too quiet. Im going to find out if I can deal with the rasp here in a few days when I install it.
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