My buddy has a edelbrock performer intake egr style . Can i run this on my jet boat or do i need a n on egr style thanks

You can buy a block off or drill and tap the holes inside the manifold to 3/8" NPT if you don't want to fool with it.

GT

Yea, what everyone ealce said. 

 But what intake do you have now ??  Helpfull hint, a stock marine 460 intake manifold is better then a performer.  The marine intake was the same casting as a Cobra Jet intake.