[Excaliber]

Loose bolts on the exhaust can cetainly be a cause of backfire! Now, no matter HOW tight your exhasut system is some cars will STILL have some backfire, which you could consider "normal".

My Excal has a "nice" backfire rumble to it on decelleration. I love to down shift and hear the rumble/pop pop slowing down for a stop sign. My headers are cracked,,,,,,,I'll loose that great sound once I fix them, lol.

Ernie