Well, it hasn't taken long for me to start modding my 06 CTS-V (I had originally planned to leave it stock...yeah right). I'm currently putting down 420rwhp/390rwtq with the following mods: - Vengeance Racing Custom Camshaft - Comp Springs/Pushrods - ASP U/D Pulley - Ported Throttle Body - Lingenfelter CAI - Kooks Long Tube Headers + Hi-flow Cats - Corsa Cat-back - Vengenace Racing tune Just added the cam and headers last week. What a difference that made. No sneaking up on anyone anymore though. Here's a vid at idle: http://www.youtube.com/watch?v=DCAOYBXtaAw And here's the dynograph: Wanna kill these ads? We can help!