The ATP designed and manufactured aluminium Waterbox offers a impressive increase in power and throttle response over the OEM Waterbox, it even offers a good power gain over the previous best known & selling Waterbox.
The Waterbox is designed to optimize space and be a simple & perfect fit in the SuperJet hull. Exhaust noise is louder & deeper than stock therefore does not annoy the neighbours or fellow riders.

Tried, tested and proven to perfection by the UK ‘s most fastidious Freestylers.
Power increases seen throughout the engine specification range.

Yamaha SJ '96-current & Rickter Hulls

17.8.10 - Current dispatch time 2 weeks