I recently took out my resonator from my JCW exhaust and replaced it with a pipe because the resonator was making vibration sounds.

I noticed that now every time when i start it up the first time when it's cold, it makes a funny hissing sound when i gas it. But once the car is warmed up, it's gone.

Any ideas?

Thanks.

 

Exhaust leak?

 

Yep......exhaust cold means it has shrunk down a bit, when it gets hot it expands.

 

Ohhh so i've got a leak?

 

ya.. it needed a new gasket