Quote:
Originally Posted by bkngo
BTW, I got my RTP installed today and it sounds GOOD and feels strong throughout pulls... Not much louder in the cabin but definitely deeper tone... can someone explain the "hissing" sound during the deceleration? I read that it is normal after installing HFC or TP.
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That is the infamous "rasp" commonly associated with the VQ platform and any kind of freer-flowing-than-stock-cats setup. You can get a hint of rasp with HFCs as well. You'll hear it in the cabin but outside the car it is nearly indiscernible. Nothing to worry about.