Hello hoping someone has had experience with something similar and can help me out. I am in the process of repowering my boat from a base 7.4/Bravo to a 450hs/8.2 with the bravo. Hull is a 1989 23' Powerplay that has been just great. I am trying to get the most performance and reliability out of the new set up. Anyone have any experience with the performance/life expectancy of the Stainless marine or Gil aluminum manifolds with stainless risers as compared to the factory Mercruiser manifold/risers. Exhaust it routed directly thru transom. Boat only ran 55 with the old 330hs 7.4 so I am looking for anything that will help provide a substantial improvement without shortening the life of my new engine. Any other tips would be appreciated also. Thanks Rich