This is my rear bumper after a 50 mile trip (was clean before):

What is causing this? Running rich?

I have a recently installed rebuilt V6 with a Borla exhaust, no cat.

[This message has been edited by yellowstone (edited 01-16-2006).]

Hi, Holy Crap........ Either your running terribley rich --or burning a heck of alot of oil. Pull your 02 sensor out and see if looks like your tail pipes. Did you do the timing , ect, ect, when the new install was done/with aldl grounded? Does the exhaust smell like raw gasoline? Might want to take out your plugs as well and have a look , plugs can tell you alot about whats going on..Hope this helps some.