I'm interested in supercharging my 2006 G35 6MT sedan. I've heard a lot about the Vortech. Does anything else need to be done to handle the extra HP boost or will the car be fine with just the supercharger install? Does it need a more free flowing exhaust or not? I am wanting to leave it looking and sounding as stock as possible. I've also read different things as far as HP gains with the Vortech (gains of 60 to as much as 115 HP). If anyone has any experience with this install I'd like to hear about it. Thanks!