Today I noticed inside of Stillen exhaust tips are covered with a layer of black soot. I am running too rich, how? I thought with the CBE and CAI mods I would be running on the lean side. Is there a solution for this? Do I even need to worry about it?

Thanks in advance.

 

It's a product of incomplete combustion (when a carbon-based fuel doesn't completely burn in oxygen). I believe it is the leftover carbon that did not burn.

It's an unburnt carbon.. Coal Dust I guess

 

normal. when you floor it your fuel system dumps massive amounts of fuel at WOT. that is just the result of it not being burnt off. its normal.

 

My car is pearl white and it is all over my car bumper most of the time.