Here's a tip for ya. Take a piece of fuel line or a 1.8, 2.0, or 2.5 seat out of a carb and install in the water line right before it attaches to the end of the expansion chamber of the b-pipe exhaust. It will restrict the flow of water into the waterbox and will reduce back pressure to give you a little more throttle responce and power.....just a little, but every little bit adds up!