http://mkiv.com/techarticles/filters_test/2/index.html Test on some top name Filters. CAI have been proven to gain more Kw's then SRI's My CAI piping never gets hot? lol SRI will give beter response compared to the CAI caus shorter piping. and the ones above i wouldnt even call them sri, they just a Pod type air filter. technically lol. but whatever all same thing one no pipe, well if u wanna call that bracket a pipe okai, then one has a longer pipe, and one has a long schlong that goes to the front bar lol