I searched and didn't find an exact answer for my question so, What gap are you guys running on nitrous? the reason why i am asking is because i am getting a decently large backfire out of my exhaust between shifts. I am running a 100 shot , rpm window switch set from 3500-6600, ngk lfr6a-11 plugs at stock gap(.35 i believe) and 2 degrees retarded via consult, should i open up the gap a little? BTW AFR drops to mid 11's up top

Also , can i run straight race gas without a tune on nitrous?