Cam and combo dependent! A lot depends on the weight of the vehicle, cam size, gear ratio and the goal of the vehicle. As demonstrated yet again, (the truck above) the ROM is a very capable intake. Other times members have posted here, the RPM seems really just fine to run low 11’s with a few guys getting into the high 10’s. I’m trying to keep in mind the vehicles I have seen and there basic combo and car. So far, it *seems to me* (which means “Observed.”) that the tipping area with a small block is with a cam around the 250 - 255@050 area & car weight over 3K, where the use of a single plane might, MIGHT! Be better.