Nissan GTR backfires mini flames (catted cobb midpipes)

GTR backfires mini flames with a catted setup on pump gas. Usually, flames happen with a catless setup with e85.
In this video, I had catless Alpha downpipes, Cobb catted midpipe and the HKS Legamax exhaust.
Custom tuned by MC Performance, this was on my Map 3, runs very rich, which is why you see the mini flames.