Developed on the Riva Racing Dyno and tested extensively on the water, this waterbox features radiused exhaust tubes and end caps for optimum exhaust flow. A unique exhaust baffle will increase the low-end power and mid-range pull of your Kawasaki Watercraft. Delivers up to 15hp on modified engines along with significant torque gains. High-strength aluminum construction will survive backfires and meltdowns. Powder-coated to prevent corrosion. A must for modified motors. Includes detailed installation instructions.

2014 & Newer Ultra 310: Eliminates restrictive 2nd waterbox. Requires RIVA Free Flow Exhaust Kit (part# RK16110) and coupler RK15-2.38/3.25.

2011~13 Ultra 300: Direct replacement for original waterbox. Use with stock exhaust outlet hose or RIVA Free Flow Exhaust Kit (part# RK16090-08).

2008~10 Ultra 260/250 models: Replaces restrictive original waterbox. Requires RIVA Free Flow Exhaust Kit (part# RK16090-08).

2007 Ultra 250 models: Eliminates restrictive 2nd waterbox. Requires RIVA Free Flow Exhaust Kit (part# RK16090). Note: Not designed for use with non-supercharged Ultra LX models.

Key Features:

• Delivers up to 15hp on modified craft.
• Machined hose flanges for reliable coupler retention.
• Radiused exhaust tubes & end caps.
• Powder coated to prevent corrosion.  

Fits The Following Models:

• 2012 KAWASAKI ULTRA 300X Performance Waterbox
• 2013 KAWASAKI ULTRA 300LX Performance Waterbox
• 2013 KAWASAKI ULTRA 300X Performance Waterbox
• 2014 KAWASAKI ULTRA 310LX Performance Waterbox
• 2014 KAWASAKI ULTRA 310R Performance Waterbox
• 2014 KAWASAKI ULTRA 310SE Performance Waterbox
• 2014 KAWASAKI ULTRA 310X Performance Waterbox
• 2015 KAWASAKI ULTRA 310LX Performance Waterbox
• 2015 KAWASAKI ULTRA 310R Performance Waterbox
• 2015 KAWASAKI ULTRA 310SE Performance Waterbox
• 2015 KAWASAKI ULTRA 310X Performance Waterbox
• 2016 KAWASAKI ULTRA 310LX Performance Waterbox
• 2016 KAWASAKI ULTRA 310R Performance Waterbox
• 2016 KAWASAKI ULTRA 310SE Performance Waterbox
• 2016 KAWASAKI ULTRA 310X Performance Waterbox
• 2017 KAWASAKI ULTRA 310LX Performance Waterbox
• 2017 KAWASAKI ULTRA 310R Performance Waterbox
• 2017 KAWASAKI ULTRA 310SE Performance Waterbox
• 2017 KAWASAKI ULTRA 310X Performance Waterbox
• 2018 KAWASAKI ULTRA 310LX Performance Waterbox
• 2018 KAWASAKI ULTRA 310R Performance Waterbox
• 2018 KAWASAKI ULTRA 310SE Performance Waterbox
• 2018 KAWASAKI ULTRA 310X Performance Waterbox
• 2019 KAWASAKI ULTRA 310LX Performance Waterbox
• 2019 KAWASAKI ULTRA 310R Performance Waterbox
• 2019 KAWASAKI ULTRA 310X Performance Waterbox
• 2020 KAWASAKI ULTRA 310LX Performance Waterbox
• 2020 KAWASAKI ULTRA 310R Performance Waterbox
• 2020 KAWASAKI ULTRA 310X Performance Waterbox
• 2021 KAWASAKI ULTRA 310LX Performance Waterbox
• 2021 KAWASAKI ULTRA 310R Performance Waterbox
• 2021 KAWASAKI ULTRA 310X Performance Waterbox
• 2022 KAWASAKI ULTRA 310LX Performance Waterbox
• 2022 KAWASAKI ULTRA 310R Performance Waterbox
• 2022 KAWASAKI ULTRA 310X Performance Waterbox

NOTE: This item is not included in our "Free Shipping" offer.