RIVA . Water Box, Ultra-260X / 250X / 300X

RIVA Racing water box for Kawasaki Ultra-260X/ 250X/ 300X/310X

Developed on our Dyno and extensively tested on water, this water box features rounded exhaust tubes and tips for optimal exhaust flow. The unique exhaust baffle will increase the low-end power and mid-range traction of your Kawasaki Watercraft. Makes up to 15hp on modified engines with significant torque gains. High strength aluminum construction will survive flashback and lightning. Powder coated to prevent corrosion. A must for modified engines. Includes detailed installation instructions.

2014 & Newer Ultra 310: Eliminates the 2nd restrictive water box. Requires RIVA free flow exhaust kit (part # RK16110) and RK15-2.38/ 3.25 coupler.

2011 ~ 13 Ultra 300: Direct replacement for original water box. Use with standard exhaust pipe or RIVA free flow exhaust kit (part # RK16090-08).

Models 2008 ~ 10 Ultra 260/250: Replaces the original restrictive water box. Requires RIVA free flow exhaust kit (part # RK16090-08).

Models 2007 Ultra 250: Eliminates the second restrictive water box. Requires a RIVA free flow exhaust kit (part # RK16090).

The Riva Racing water box is compatible with the following Kawasaki jet skis:

• 2011 KAWASAKI ULTRA 300LX
• 2011 KAWASAKI ULTRA 300X
• 2012 KAWASAKI ULTRA 300LX
• 2013 KAWASAKI ULTRA 300X
• 2014 KAWASAKI ULTRA 310X
• 2015 KAWASAKI ULTRA 310SE
• 2016 KAWASAKI ULTRA 310X
• 2017 KAWASAKI ULTRA 310X
• 2014 KAWASAKI ULTRA 310LX
• 2014 KAWASAKI ULTRA 310SE
• 2015 KAWASAKI ULTRA 310LX
• 2018 KAWASAKI ULTRA 310SE
• 2009 KAWASAKI ULTRA 260X
• 2016 KAWASAKI ULTRA 310R
• 2016 KAWASAKI ULTRA 310SE
• 2017 KAWASAKI ULTRA 310LX
• 2017 KAWASAKI ULTRA 310R
• 2017 KAWASAKI ULTRA 310SE
• 2018 KAWASAKI ULTRA 310LX
• 2018 KAWASAKI ULTRA 310R
• 2018 KAWASAKI ULTRA 310X