My personal experience with the nizpro big big cooler is this: Ran at Calder Park raceway , still std airbox and crossover in 38c temperature, ute went 11.36 Ran at Calder Park Raceway, still std airbox and crossover in 22c temperature, ute went 11.24 That is a realtime comparison how good that cooler works, not to mention back to back runs on a dyno I lost 0.1 rwkw.