I see that you have modified the intake, so if you open up your exhuast you will see a little better performance.
Exhaust opinions are like color choices, everyone has a different opinion. Listen to each and Let your own ear
decide. Personally, I like the stock Bosal sound of the GXP over Magnaflux or Flowmaster. Its deep and throaty at an idle, crisp and snappy at a wide open throttle. Almost screams at the top end. If I activate the nitrous by punching down the accelerator, it really turns heads.
Dan, I was hoping for you to open that thing up in the vid.