Going to smaller domes would deffinately get you more power gains, because you are increasing your compression. As far as runnin' 93, you need to do a compression check to find out. You eleveation plays a major role in this as well. If your compression is above say 155 you will need to run, at a minimum 50/50 race 93 or AV100LL and 93. You best bet is to contact NOSS on here and talk to him, and he'll hook you up with you options............. :beer: