Has Anyone Done Any Dyno Testing Comparing The Gill \merc Manifold To The Hardin Marine Cyclones? Or Does Anyone Have Live Boat Test Data With Speeds?thanks

I just replaced my Gil's with cyclones. Biggest diff between the two I've seen is tone is alittle deeper, and you can get to all of your spark plugs, and block drains now. they also give you alittle more "bling" lol. hope this help?

performance wise I can't help I got rid of my MPI stuff and replced it with carbs, plus some other upgrades.