Quote:
Originally Posted by Dirk McGurck
As soon as you take out the cats, you'll get hiss.
Do you have any resonators in the system?
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I still have my resonators on! Also the hiss was only on deceleration before the new y-pipe now the hiss is way louder and hisses as soon as I let off the gas. The most noticeable difference is the cabin noise is very loud before it wasn't that loud until after 3.5k rpm. Exhaust leak maybe ?
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