RIVA water box for Ultra

Developed on in-house Dyno and extensively tested on the water, this water box features rounded exhaust tips and tubes for optimal exhaust flow. A unique exhaust baffle will increase the low-end power and mid-range traction of your Kawasaki watercraft. Delivers up to 15 hp on modified engines as well as significant torque gains. High-strength aluminum construction will survive flashbacks and meltdowns. Powder coated to prevent corrosion. A must for modified engines. Includes detailed installation instructions.

Main characteristics:

Delivers up to 15 hp on modified boats.
Machined pipe flanges for reliable coupler retention.
Radiated exhaust pipes and tips.
Powder coated to prevent corrosion.
Additional application requirements:

2014 and newer Ultra 310: Eliminates restrictive second water box. Requires RIVA Free Flow Exhaust Kit (Part # RK16110 ) and RK15-2.38/3.25 Coupler.

2011 ~ 13 Ultra 300: Direct replacement for the original water box. Use with stock exhaust tailpipe or RIVA Free Flow Exhaust Kit (Part No. RK16090-08 ).

2008~10 Ultra 260/250 models: replaces the restrictive stock water box. Requires RIVA Free Flow Exhaust Kit (Part # RK16090-08 ).

2007 Ultra 250 Models: Eliminates restrictive 2nd water box. Requires RIVA Free Flow Exhaust Kit (Part # RK16090 ).

Note: Not designed for use with non-supercharged Ultra LX models except 2023 and up.