I've also noticed a faint hissing sound when idling since having my new x pipe installed. I can hear it in the cabin and outside the car mainly if I put my head right next to the right rear tire. It isn't a constant hiss, it's more like a short hiss at random intervals maybe every half second to a second. It's not very loud either, I really have to listen to even notice it. Is a hiss like that more common with a non resonated x pipe? I know where the x pipe is welded together it has the cross over hole so I was hoping its just air going across that hole. I hope it's not a leak. I had the shop use the existing gaskets like Tony said.
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2012 GM 6MT sports package | FI non res cf exhaust | K&N Drop Ins | Viper 3303 security system w/ tilt sensor | GTR start button | 35% rear 45% side window tint | Michelin PSS
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