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-   -   effect of extension boxes? (https://www.offshoreonly.com/forums/drives-lower-units/259638-effect-extension-boxes.html)

senza 08-05-2011 06:36 PM
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?


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