i got the JLT Cold Air and i noticed a rather large gain in the HIGH rpms... when i was datalogging the other day w/ my predator i was getting ambient air temps w/ my IAT sensor...
at best the TBplenum gives you 7hp and thats if you have CAI, midpipe, headers, catback... and a buncha crap. ive got midpipe, catback, intake and plan on getting a tb/plenum after a few more mods...