TexomaPowerboater

Thanks for post guy's. I have seen that higher riser manifold, but is that the right choice for silent choice HP500's? There are two manifolds with silent choice, one by stainless marine and another by Gill, I presume the mercruiser 500hp exhaust was the gill exhaust under a OEM label. When I look online like here gil-header.jpg (1920×1229) (cpperformance.com) I can see the higher rise manifold, but the magnum choice appears to be setup for silent choice and nothing mentioned on the HP500 riser manifold about silent choice. Stainless marine manifold with silent choice does not appear to have the higher riser either as a choice for silent choice exhaust.

TexomaPowerboater

Yeah the idea of potential water leak makes turn downs or mufflers a better alternative.

Donzi1979

iTrader: (1)

I should add my risers have been modified to accept the diverts they are not as long as(as in one pieces) the pic above towards the transom. I assume Donzi did that at the factory I will try to take some Pics tonight from a better angle.

AllDodge

iTrader: (1)

I had Eddie Marine mans and elbows on my stock 502 MPI using short risers and Corsa modified diverters to the Y pipe. After repower 530HP they were placed on the shelf and got +3 risers and turn downs. Its quite around the dock

Donzi1979

iTrader: (1)

This is how the diverters were done you can see where they cut and shortened. When I had it apart there is small dam welded on the bottom. Honestly you could just use the tails and get the large muffler tips, it really takes the bark out of it. You can have a conversation at cruise speed.

seafordguy

Just my opinion, but I hated my switchable mufflers. Constantly leaking around the seals, pulling the tails every year to replace the seals. Greatest day of my life was getting rid of them.

again, just my .02.

TomZ

iTrader: (2)

Id just forget it and run thru-hull. If too noisy, a set of mufflers will make it manageable. Or use the turndowns like AllDodge recommended (a great idea).

SABER28

pulling kids on a tube? did that with mine, its a hell of a wild ride doing that. please video that and post it for us here. lol

TexomaPowerboater

Yeah that will probably be a funny site. Think I'd have any hatch clearance issues with the higher risers?

Donzi1979

iTrader: (1)

They are almost the same height as the top of the spark arrestor if not slightly shorter, if that helps.