as gus said, in a nut shell, longer inlet trumpets/tracts promotote midrange power where a shorter increase peak hp. not sure how this fares in the forced induction world. would speculate its much the same. but i always thought a turbocharged engine can still produce rlatively huge hp/torque on the shittiest of flowing engines compared to n/a equivelant. higher boost rs turbo vs gas flowed xr3i for instance. anyway sorry for the drift, how much are these inlets rob? what is the std inlets max ability in terms hp. i know the head on the rst can manage 250hp before its restrictive.