First of all this is a purchase from Revain inventory so for some reason someone bought it, opened it up, repackaged it and sent it back to Revain. I'm starting with 3 because the ports weren't finished exactly to spec. This means that the engine head's exhaust "holes" are 4 large ones on each side. to "fit" up to 4 holes on a new exhaust manifold, the closer the match, the better the overall performance and less risk of damage. Your best bet is to get a new manifold gasket, once you get the new manifold it will be in the box between the cardboard sheets so take a look. Place the gasket on the new manifold and look for "metal" visible in the "holes" or even circle it with a fine marker, remove the gasket and that should give you an idea of how much material, if any, must be removed to conform to the factory sport. Various files and/or power tools immediately save time. Once I gain a few miles I will change the rating. right now to start central star
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