Offshore style exhaust

[Roflhat]

You can buy this and bolt/weld it on http://www.bobsmachine.com/Exhaust-H...403-220000.htm
It will mak a bit more noise and power than stock

Looks interesting, I've sent them an email about it. So will adding just that bit give you more power? Or is the power gain from blocking those holes and drying out the exhaust?