i installed my cat-back exhuast system today. I found that there is a leak at the donut gasket when the car is in idle. The leak dissappears when the accellerator is pushed. Is this normal, or could it be a potential problem? Any info would be greatly appreciated

 

I'm curious what kind of cat back did you install? I'm having the same problem w/my stromung.

 

Any leak is a problem,make sure the gaskets are new and recheck the tightness of your bolts.I know getting the best seal requires tightening each side evenly.Like the left side 4 turns the right side 4 turns and so on,hope this helps.