JimmyB

I have a MY01 with 33K miles on it. I change the oil & filter every 3K miles. About 5 months ago I installed a Berk header & test pipe. there are no CELs, I replaced the PCV about 60 days ago and at that time I did the modified krank vent using the Supra PCV. I have also done some intake manifold work: Porting to 70mm to match a 70mm TB and using a Hondata gasket.

I have checked my oil and I have not had to add any between oil changes,

The car runs great and has not shown any signs of problems other than the black soot on the exhaust tips.

Any suggestions?

jeggy

normal.
put the stock catalyst back on and you'll see the soot go away.
or leave the test pipe on and tune the car to run lean. but thats something you should NOT do.

JimmyB

My other 2 choices could be to leave the test pipe on and just wipe the soot off or install a hi flow converter when I put the rest of the exhaust system on.

Spectre48

The black on the tips is not related to oil usage (typically). The black on the tips is carbon buildup, caused by unburnt fuel getting into your exhaust system. This means the car is running rich. As stated above, the stock cat converter blocks alot of this from getting onto your tips.

CKit

Eventually, you'll have the soot on your bumper as well.

Claybar.

Ap1super

Its normal, just polish it up.

ChefJ

gas??

TheCarGuy2021

This is normal with a test pipe.

breakneckS2k

I've got a hi-flow cat and it does the exact same thing. It's perfectly normal. I'm just lazy, so I have black tips

cthree

It's all the shit your cat burns off in the name of clean air, smog.