Im the one ARS Marine is talking about, and yes we picked up 10 mph with his kit. It took about 4 hrs to install and worth every minute of it.
I realize some people may find it fun to take out there motor and tweek on it for about a month and also spend tons of cash BUT ill stick to the easy way out with ARS's kit. And before you say OH but I have a big motor, SO DO WE yes we have a 500inch Blow motor so the product works............................................. ................PERIOD
TunnelMan...where does that put you speed wise?