ok, so i have been hearing this hiss and sputter from the area of my downpipe for several weeks. I finally got it on the lift and checked it out and it appears to be coming from the flexpipe. I know many people have had their downpipe break at the flexpipe. Thing is, when you cover up the exhaust tip, no leak or hiss at all from that area, it only happens under acceleration and is getting louder. I was just wondering if it is a crack in the flexpipe, which i cant see one if it is, why does it do nothing when i cover the exhaust tip. anyone else have this problem?

 

its your CAT, not the flex pipe. The cat is shot

 

i have the zzp header/dp combo and it does the same. its just the sound of the exhaust screaming through the header at over 1000*

 

its sounds like he is still stock

 

yeah its still stock, i thought it could be the cat as well.

 

its the cat then, thats what it will sound like when its bad or on its way out.

 

I was afraid of that. oh well i guess its just the excuse i needed to buy my header and dp. Is it a good idea to get retuned after adding the header and dp?

 

will never hurt, but its not needed persay. If your still under warranty go get the downpipe for free until you save up for the header and dp you want. Its covered

 

im taking it to the dealer on monday, if covered thats exactly what im gonna do. Ill let them replace it under warranty and that can hold me till i can afford the new goodies.

 

As long as you within your warranty period, its covered. Do not leave with them telling you otherwise. Many people have gone back to get it replaced

 

the stupid GM cat sucks and gets plugged fast.

 

yeah, its one of the many weak spots on the car, im gonna replace it with something better soon, but id like to get it changed now to hold me over