Not sure if this is normal or anything, I recently got a nismo exhaust and it gets really dirty. the bottom of my tips always get black for some reason. I can wipe it off to clean but whats up with that? My stock exhaust never got dirty like that. Stock cats are on at the moment too. Sorry if its a noob question.

 

its normal, are you burning any oil by chance?

 

its normal...especially with that exhaust, it gets pretty dirty pretty quick!! hope you like cleaning

 

lol dang. Thanks. It's an eyesore when it gets so dirty so quickly. I don't think I'm burning oil either.

 

yeah... mine is turning all yellow/brownish at the tips but im running test pipes.. whats the best way to clean it?