K&N Air Filter Question

[03GMCinBC]

I put a dropin K&N filter in my truck a few months back. I have noticed a black soot on the tip of my exhaust pipe recently. I thought I saw a thread a while back that said this would be a side effect but I cant find it.

 

Anybody else having this problem? I dont actually see my truck smoking under acceleration but something is going on...

[LikeaRock14]

I have the same problem, except my whole exhaust tip goes black with rubber

[black&grayHD]

It prolly is just excess carbon buildup caused by you running richer. New hi-flow intakes move more air through the system so the computer dials up more fuel. More fuel=running richer than normal and more power as a result.

 

I've got the same issue w/ the air intake on the vette

[Elwood 2000]

I have a stock air filter on my '00 5.3 with 70k miles. My tailpipe has had a black soot in it for 50k miles or more.

 

I wouldn't worry about it.

 

[Markeaux]

Black pipe tip here, too (it was black loong before adding any mods).