I have a 96 SS witht the 2 on the left exhaust, stock manifolds, and no cats. My car seems to back fire ALOT when i lay off the gas. After a good amount of driving it doesnt seem to do it any more. I have had people tell me thats the 2 on the left just does that but i am gettin worried

 

Most Z28's I have heard w/out cats or gutted cats back fire alot. I think it is more related to the no cats than the 2 on the left. A cat's job is to burn un burned fuel. If not burned it pops or backfires. Correct me if I am wrong.

 

When your pipes are cold it will "pop" but it is not backfire. More or less "cackle". When the pipes are warm, it sounds good usually.

 

When the car is cold its in open loop and runs richer then when its warmed up in closed loop. The excessive gas when in open loop causes the backfire.


Hal