A friend of mine has an old Pro Stock Pontiac w/a Nitrous Fulton 648 BB Chevy with 2 cast 1150's which I actually made slightly smaller by skirting down the banjos and before I went through em the afr's were all over the place like 3-4 numbers different from leanest to richest. He went a 1.06 60 ft 4.36 1/8 at 167 mph with it like that then after stagger jetting and bleed changes the afr's were within1-1/2 on all 8 cylinders and he went a 1.01 60 ft 4.30 1/8 at 170 mph so not exactly sure on the actual hp power gains but even distribution is the key to good clean power......