he uses a 6 blade 88mm drop in wheel for inducer limited classes. BD uses the cast 8 blade wheel for their 2.6 charger
with it being protrusion i think you are going to be limited. We had a few guys last season running a hx 82 with a 2.6 cover. I feel that once a wheel has to protrude into the housing you are extremely limited in the amount of air it will flow. just my $0.02 So a s500 would be iffy but s480/hx60 protrusion 2.6 would light and stay lit.