Welcome to the board! Price-wise you're looking at around $1500 minimum to get a thru-hull system, that's if they even make one for the 4.3L v6. You won't want to cheap out on this, and installation should really be left to the professionals, since it requires two 4" diameter holes cut at the waterline. I really wanted thru-hull exhaust too, but then decided to put it on my wishlist for the next boat.
