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

[StReeTz]

Originally Posted by KaminaSan

Mine does this every single time I boost, and the BoV goes off, when it decels to 1500rpm.

Never did that when I had the SMIC/stock bov.

Are you 100% stock?

If your blow off valve vents to atmosphere and is close to your mass airflow sensor then the discharged air will be read by the mass airflow sensor causing a rich spot upon sudden throttle closing or blow off. You can recirculate the blow off valve or make sure the MAF isn't too close to the blow-off valve.