I finally put my new thru-transom headers on my boat last weekend! Removed the log manifolds and risers that were a pee-pee 2 3/8" outlet to a full bore 4" system!! What a differance in performance, picked up 300 rpm with no other changes! I will need to fatten her up a lil now tho. couldnt afford the jacketed style, but found a deal on these here on PB. Now it turns my "A" 5600. Super Stoked!! The only bummer is that i need to widen the hatch 3+ inches. See yall at the water!