As far as porting mild to wild depending on your application, From just port smoothing and cleaning to a full on hogged out drag port. Different porting styles for different riding conditions. Just a simple port smoothing won't give you a huge power increase, but typically will inrease response and powerband smoothness. True port jobs will always increase power by making larger, smoother and properly shaped ports. The crazier the porting the less reliable it will be, and typically will have a narrower powerband, but a lot more power in the that powerband range.