Those look like the big Gen3 Stainless Marines, not the Gen 2. Ive heard the Gen3s are great on the dyno, havent heard much about the Gen2s on the dyno.

it all depends on what you are building.....you cant go wrong with stainless marine.....buy gen 11 if you are mild buy gen 111 know if ya plan on a future of sick hoarsepower..........

At just over $1,000 per set the one from Revolution Marine is hard to beat for this application.

Can you expect to get at least 1 -2 mph gain with headers?

You can expect it, but that don't mean you'll get it!

Thanks for the advise everyone.Now I have to make a decision,so many choices.

Anyone have info on headers for " LS1 thru LS7 " motors ? ?

THANKS CHEERS AW

Just remember that IF you run the motor out of water ( raw water pump failure ) the aluminum exhaust manifolds CAN melt down.
If you plan on doing ANY more work to the motor at all ( most people do ) then I would go with TRUE headers ( I have Lightnings and love them )

The best performing & lightest manifolds are the Dana, Gil, Imco & Stainless marine maifolds.. The EMI's are also built pretty well for the money. Anything else is a stock or worse than stock replacment set up in my opinion.. Jamie

I saw these new manifolds / headers at the Maimi boat show.
What I really liked about them is that they continue to run the primarys right to the end.

Alot of the other manifolds stop short and go right into a collector persay before it even gets out of the manifold and into the main pipe.

Your photo in your post shows that also.

Chief engines really likes stainless marine also.

Cougarman