need to know which exhast systems would suit best 454mag's does anyone have any experience with this application

jack.

What do you want to know?
Merc put Gil manifolds on a lot of 454s, they work very well. Stainless Marine makes a nice replacment. GLM makes an aluminum copy of the Merc manifold, it's a little cheaper and lighter than the Merc. You won't see much increase in speed just from a manifold change. But, as part of a perforamnce package(cam, carb, intake and exhaust), you can really wake up a 454 mag.

Hard to beat Revolution for the $ http://revolutionmarine.com/shopsite...bcexhaust.html

Helped a friend install on a 500hp BBC, good fit and quality as far as I could see. Cant beat the price

Yes, that is another one that I have always liked. Another is Lightning tubular headers.

You can find the revolution exhaust on ebay, usually go for about 50 bucks less than what you can get them on their website, polished set is a little more money.... look nice for the money...

I run the Lightnings and love them! Great system and they stand behind their work.

Lofty............ dude......... what up?..........

Reed you hijakcker you! Are you alive or still ball deep in nookie

If you are in saltwater, you may want to stay clear of all aluminum.
I got stainless marine... 5yr warranty.