Administrator - "Loose Nut" - Bandera, Texas
2001 Vstar 1100 Classic (sold), 2006 HD Electra Glide Ultra (totaled) 2006 Vulcan 900 (current)
The gain in power would be slight as the stock Yamaha heads flow well. It would be hard to justify the cost if you are having to pay someone to do it. Your biggest gain in flow would be to port match intake to head and exhaust to head. But even those gains would only be at higher RPMs that's not really all that usable on a street bike. If you are looking at a little more easy way to gain low end pulling, go down a tooth size on the front pulley. You would lose an ever so small of top end. The Stryker pulley is 31 teeth and the Vstar 1300 is 30 teeth.This will give bike a -3.33% Ratio change from a Stock 2.258 Final ratio to a Modified 2.333 Final Ratio. You use the same belt with this set up.