Ok i drilled out the holes about 2" from the bottom. I used 4 intakes, 3 with caps and one with a ball valve. Which is the better type of exhaust for this setup? My drum lid has 2 bungs holes on it (one big one small) so will it be better to use the 8- 1/2" holes or use a pipe and 90 exhaust. Those freakin things make the lid HEAVY!!