That's true. 90% of it is when I start the car, or if I stab the gas after just starting it. If I let it sit a few minutes, it cuts way back on the black stuff. I have a feeling it could be more than just a byproduct of gas though, since my pipes would shoot some residue no matter how hot the car got, before I did all the cleaning/tuneup stuff I listed above. Now it seems to only do it when it is first started.