Originally Posted by Knot 4 Me

Just going off of past visuals I would think there is a difference in the height of the exit points of the risers and possibly even a bit of the angle. Not sure just guessing those would be the differences between the two. Surprised your Fountain did not come with silent choice yet they installed and then blocked off the y-pipes. I've never been a fan of the pipes being there and capped. Just makes me nervous![/QUOTE

no the Y pipe is not capped off,right now the boat has thru hull and Y pipe exhaust working together,,it has what looks like diverters but has nothing inside the diverters ,,so some exhaust exist out the Y pipe and some out the Tips,,actually not a bad set up,,

Originally Posted by Bama

The 496 has a 3" exhaust not 4". That is the difference.

Originally Posted by Bama

Are you sure? My 2003 fountain has the same 496 ho with the quick and quite fountain exhaust. Mufflers are 4" diameter but the exhaust manifold risers are 3". Y pipe is 3". 3" through transom then pipe is welded to 4" mufflers.