Doug and I both used the stock intakes on 500in.ers. We went fast at that time. Doug picked up a ton with the indy. The power level varies with the head flow and cam selection. I think with dougs combo they picked up 55hp???. I have sean as much as a100. I never dynoed Jim Wipples motor for a A-B test but he picked almost a 1/2 second. From 10.3's-9.8's. I went high 9.8's as an average with the best 9.68. So one could use that intake for that combo but there is allot of power over the stock intake with the indy. Mr.340 that looks almost exactly like mine did.