Hey guys, New member here so hopefully i posted on the right are. Anyways I have an 89 Arriva 2450 with a 7.4 bbc merc. At the moment it is pretty much stock besides intake manifold and holley carb along with electric fuel pump. Anyways would i see any gains by swapping out the stock exhaust manifolds to Stainless marine performance manifolds with stock raisers? Only reason I am kicking around the idea a friend has a set forsale for $900.00 in very good shape. I belive he is going more of a header style as he has his motor on the rebuild stand. Thanks in advanced.