effect of extension boxes?
08-05-2011 | 06:36 PM
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From: new port richey / cape coral fl.
effect of extension boxes?
have a 38 cat with twin 575sci's upgraded to about 650hp with bigger pullies and reflashed computer with 32" brvo 1 props and x drives wot 110 at 5200 would like more bow lift and top end, what about extension boxes?
