Bad backfire

So when I was at high speeds wot car backfired bad it seems like it loaded up and fired all the fuel them boom thought I blew the motor any ideas

It looks like you don't have a garage page set up. Let's start with what mods have been done to the car? Has the car been tuned? Any DTC's? Was it pulling cleanly before the backfire? Does it only backfire in third (AOD) or fourth (M5R2) at WOT? You need to provide good information to receive good information.

It is aod only backfires in third wot no mods except 75mm t/b and cai i do have about 10k on plugs i am changing them today were a little fouled up no tune