i just got done doing a thru hull job on my stinger. you should be able to use your stock manifolds and risers. if it is any thing like mine all you hafta do is pull off every thing between the riser and Y-pipe an toss it. cap off the Y-pipe with black rubber pipe caps found at a hardware store (dont forget to double clamp every thing). than run 4 inch soft marine exhaust tubing to your thru hull tips, which im sure you could find in "parts wanted" or "parts for sale" section of this forum. you'de be hard pressed to be into it for more than a few hundred bucks if you play your cards right. i can post pics if you need some referance. good luck.