carbon deposits on my bumper

[ryandale]

I have black soot building up on my bumper. I assume it carbon, possibly unburned fuel. Mods. to date are hv3. AP605's gapped @ .055, zzp gen3 wires, removed resonator, throttle body spacer, zzp pcm, and I'm sure that's all. I had a 54k mile engine put in about 3k miles ago now this soot **** is building up. Any ideas?

All mods were on previous engine and no issues.

[sdavis11b]

Do you have a cat?

[ryandale]

Also I have a gutted air box w/ spectre air filter.

[Fivefingerdeathpunch]

still running a cat converter?

You could be running way rich at WOT and its leaving behind the unburned fuel.

I am catless and my exhaust tips turn yellow, then black after a while.

[ryandale]

The cats body is there but that was definately one of my thoughts. My car hasn't gotten any louder.

[CTKGP09]

dont zzp can tunes generally run rich?

[sdavis11b]

dont zzp can tunes generally run rich?

The sure do, as well as intense tunes.

[Fivefingerdeathpunch]

All canned tunes will run rich.

Its how they try and save their butt.