i tried it both way....i actually believe the cai works better just b/c w/ the jrsc the under hood temps are outrageous, the cold air reduced that alot, but i hear the short ram makes it seem more responsive w/ the jrsc, but w/ a jrsc u really need it more on the top end anyways, i beat most turbos off the line its the 1/8 mile and pass the jrsc's dont perform well.....