Anybody using the dana marine exhaust? Just curious what kind of hp or torque these have over stock manifolds. Have 454 mag efi motors 385 hp. Looking for some new exhaust. Any suggestions? Looking for biggest bang for the buck

You can expect to lose roughly 80 lbs of weight per engine, gain 35 HP and 35 ft lbs of torque.

We ran a FORCE OFFSHORE CAT with a pair of in house FORCE NA 625 HP with the DANA set up. They worked very well. I highly reccomend them. GOPS of torque and superior workmanship on the product.

Dana Marine- How would these work on a closed loop cooling system in salt water? I could run antifreeze through the lower and cool salt water exiting through the risers, or would you recommend salt through the whole thing? I don't know if 190 degree water will cool the lower manifold enough.

The manifolds are easy to plumb on a closed system. 190 degrees is high, 160 would be better. The manifolds have a closed riser flange so there's no potential for a leaky gasket at the riser flange.