I was running the Ark cat back on my car and once I switched over to test pipes (Motordyne) I got a terrible whistle.....It was to the point where I hated driving the car.
I then installed the Fast Intentions cat back and it was fine. The whistle was coming from the x-pipe portion of the Ark exhaust.
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Fast Intentions-Stillen-Avant Garde-UpRev-319hp/265tq- Gone but will never be forgotten
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