where can I find a transom water pick up that would use a 5/8 hose to plumb my intercooler and dump as a drive shower..thanks Rob

Call Hardin/CP Performance. If they don't already offer it, then they can make it for you in a few days. That's who I use. Excellent company to work with. They will make any configuration you can dream up.
1-800-225-9871 ext. 17 -Mike Mays.

Good luck
Eddie