A fellow formulist picked up a solid F-3 LS this summer. We did all the show stuff,(paint,upholst...) but it's too quiet. The snag is that the old merc manifolds have the riser at the rear. Looks to me like all the aftermarket systems out are for the later style center riser applications. Any ideas about mods or suppliers of older style exhaust. Cost is an issue for him. Maby just go straight thru and then do what with the "y"? We don't think the fish in Lake Mich. will complain about the noise. Any help would be appreciated.