| being water cooled is good especially when the wheels keep spinning after engine has been shut off. And the ball bearing is better for spooling (and this is debatable as to much how it really helps) but it is better for wear and for reversion of air flow. It has been shown that the stock exhaust manifolds suck really bad. And I am very curious what kind of power 2530s would do with a some free flowing exhaust manifolds. I bet you would see increased spooled and horsepower gains. I hope Greg Dupree gets his done soon and starts selling them.

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