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The Injen Dual Intake is only intake so far for our car that is a true CAI and the others like the JWT act as HAI. Get the JWT if you just want sound and you might lose power as some people have and COBB Tuning has tested. Evey owner of the Injen is 100% satisfied and surpirsed with teh results and power gains of teh Injen as far as I know. I didn't do a direct dyno comparisoi but from switching from teh stillen daul long tube intake whcih has a similiar desging to the JWT and from switching from a dual 3inch exhaust to a dual 2.5 together gained 15 WHP. Did most of the power come from gains of a better intake design or a better exhaust? That is up to you to decide. I think gains over current exhasut were around 5-7whp max and the rest came from the intake swap but that is imo. Take from it what you will and I'm sure most otehrs will back up this intake as well...
EDIT: KramyKram had these exact JWT Intakes and swtiched to the Injen and has noted a gain in power from the swap...