does anybody make anything like that? it seems a lot of power loss in stock style manifolds would be the tight 90 degree turn in the riser. and there are lots of people out there running merc center dump manifolds. thanks.

welcome to oso! imco makes a stainless riser thats designed to work with the stock manifold, but if you are looking for better flow without spending alot, find a set of 496 manifolds and call it good, the 454/502 log style manifolds and risers are very poor performance wise

The actual manifolds are just as much of a restriction. Not worth upgrading to the Imco pipes IMO.

just checked imco's site. 800 bucks apiece? i only have 1500 in the whole boat so far. thanks.

Welcome to high performance boating!!

...but the bling is worth 1000$

Not sure what you are looking for, but i have two sets of mercruiser risers off of my HP500's sitting down my cellar and i live in Gloucester N.J.