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Discussion Starter · #1 ·
Paired it with my K-Tuned Exhaust System. No hiss at first but after the downpipe install, it started hissing on cold start and when I give it gas. The hiss is coming around the muffler area.

I know that downpipes normally hiss but I just want to get everyones opinion if this is a leak or not.

here’s a cold start with the hiss

edit: the hissing stops when the car is fully stopped/idle
 

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Sounds exactly like every 9th gen Si I've heard with an aftermarket downpipe.

To be sure, you can always feel around, but if it goes away after a minute that's normal.
 

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yeah that's normal, exactly how my skunk2 dp sounded, was only able to last with it for a few months until i was finally able to get my hands on a rv6 catted dp
 
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