No, that's putting the pressure right back in the engine. RPM will slow and run badly. You have to pull air out of the engine somehow. You can use manifold pressure with pcv, or exhaust. For racing you run about a 1/2 inch line from both valve covers to the collectors to scavenge the windage out of the engine. It works good, but you can't really do that on the street too well. A lot of funny smells and some smoke when braking hard sometimes.