Who makes the best exhaust manifolds and risers for stock 502 gen 6 MPI's with Corsa captain's call? This is for a sportcruiser and fuel efficiency is more important than speed.

I have Eddie Marine on my Challenger and really like them. I also saved over 200#'s off the back end. Mine bolted right up to the existing system. I paid a little over $3000 for 2 engines. Others (CMI, Stelling etc,) cost an arm and leg, but it depends on what you are looking to accomplish.

The stock ones that came on the engine

Stainless Marine, Imco, Revolution Marine, Dana, Gil, and ...
Lots of good choices.
I bought Stainless Marine.

I had a pair of Eddie Marine on our 92 Fountain w/ 502's...
...worked well, easy to install
Carder

We carry a wide variety of exhaust systems from Gil to Imco to Hardin and then some. You can see most of them here--->http://www.cpperformance.com/product...t_systems.aspx
If you give me a call we can figure a system that fits your particular application the best and will give you the results you desire. Hope we can help,

Thanks,
Brian

Exhaust will not change fuel efficiency to any noticeable degree. If fuel efficiency is what you're worried about, you've got the wrong hobby.

Thanks everyone for your input, yes even you Big Jim but your statement is not correct.
Griff this is my life long hobby, I'm just asking for educated input, and I am simply stating what my directive is as opposed to horsepower.
Everyone else; Thanks again. Some one mentioned Imco Thumper series before but it doesn't mate to the Corsa. Imco has the performance series that would work if any one has experience with that let me know. Also I looked at the Stainless Kit and from what you guys wrote above that may be the right ones. CMI seems to only have header style. I will look at Eddie Marine, per your recommendations Carder, and kenvik01. Also I will look at Gil, Dana, and Revolution.
Thanks,
Moondance

No matter what exhaust you put on, its gonna run within .2 mph of the same speed at the same rpm. It will be burning the same amount of fuel and won't be any more efficient.

The best thing you could do to make sure the boat is running at its most fuel efficient rpm/speed is to get fuel flow scans.

CP Performance, nice web site, I saved as a "bookmark". I like the Stainless, and the Hardin kits. I want to look at Eddie Marine that the guys suggested.
Thanks