I have one extra RXP-X waterbox setup including

head pipe assy
elbow fitting 90
exhaust hose
2 x tridon clamp
formed hose
lower formed hose

been in the ski for 1 hour. Asking 350 usd.

I have also one Thru hull exhaust kit for RXP-X by Piranha. Used 1 hour. Works perfectly with oem waterbox in RXP-X (made complete from blue silicone hose). Asking 180 usd.