I have a fresh 657 that I have Mikuni 38s and vortex flame arrestors for. I have the salty old stock duel carb pipe for this but I would rather use this ss Mariner pipe. I got it off an old yellow engine and I'm afraid it would cut performace(single carb 587). It sure would look, sound and better resist corrosion than the stock ones. This is going in a 90 hull and I am using the yellow engine electrical. I've got a Triton 650 billet head lying around the shop so I'm going to throw that on. The jugs are 1mm over. So what do you guys think of my proposed setup? I think Rossier had their name on that same pipe back then. I have a 717 sized exhaust exit in the hull if that matters. Thanks in advance