I've got a set of Lightning headers with dry (jacketed) 4.5" tailpipes through the transom. Because of the mickey-mouse slip fit connection, I'm getting some water leakage back into the motor, even with the recommended silicone sealer between the collector and tailpipe. I'm thinking of replacing them with one of the new style cast manifolds that has the individual runners, i.e. IMCO Powerflow Plus, Stainless Marine III, or Dana. Anyone have any comments or experience with these on a big motor (600 inch 800+ hp)? The Lightnings are very small primaries, so I'd almost expect to pick up a few ponies with these big long runner manifolds. Probably want to add some good silencers inside the pipes as well to keep from getting kicked out of the marina again. Maybe Rexone can give me a quote for a complete system?
Thanks,
-Brian