I've notice when i start my engine,or when it's idling after it's warmed up and during cool down,i can hear crackling mostly on the passanger side,it's like when metal gets hot or has oil on it,that type of crackling noise,I was wondering if this is normal,it's definately loud enough to notice it alot. I have a downpipe,midpipe,Greedy PE.

 

I think it's normal. Probably just the metal cooling and shrinking.

ant