Gunshot Pop From Exhaust&Black Smoke/Soot on rear bumper

[ModernS30]

Originally Posted by ayororo

I dont have a presurizer^

Oh and so i looked at my muffler today
And it looks like white/grayish smoke is coming out of the muffler but barely cuz it dissapears
So fast.. This relate to anythin?

Isn't it uhm... Cold outside... Have you checked your timing yet? If not, stop posting shit, go check your timing. If that is right, check for a boost leak or a vac leak. If you are good there, check your fuel pressure. You are obviously running to rich. There are no signs of you attempting ANYTHING anybody has told you to try in here.

My stock KA24DE backfires on decel sometimes, I don't get black smoke like you say but my bumper has black on it as well as my muffler. Now my car doesn't have a cat.

Now go try things people told you to try and maybe your car will be fixed faster than if you keep posting on here.