Luke, according to the CARB website, the 2008 5.7L engine was 296hp non-cat exhaust and 310hp with the cat exhaust. 5.7L are not 350hp. The 6.0L in 2008 is rated at 402hp.So, if you have a non-cat 5.7(350 cubic inch) now and change to a boat with a 6.0L engine, you are gaining 106hp. 36% more power. If you have cats on the 5.7, your gain will be 89hp. Either way, the 6.0L makes substantially more power than the 5.7.
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