i was always under the impression that CAI really dont help turbo-charged cars for two reason. 1. The air goes through a turbo that heats up the air and 2. turbocharged cars usually have an intercooler to cool the air, so ur 8-15 degrees ur cai is going to give you will be lost in either one of the 2 points above. i think your best bet is www.needswings.com