I just got my Non res Fi TP installed yesterday with FI catback non res. There is hiss on low rpm decel and according to my installer its because of the engine. The cats muffle it and thats why we cant hear it when stock.
In 5th/6th gear under 2.5k rpm there is a good amount of drone but as soon as you rev higher it goes away.. Sounds amazing when going WOT!
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