The best Ski-doo XP y-pipe on the market for 2010- 2016 Skidoo XP800R carbed or XP 800 ETEC sleds. This Petschke y-pipe has been dyno tested at Dynotech Research and field proven everywhere to be the best bang for the buck for horsepower on your Xp800 sled. Dyno testing has shown a 4hp gain with this bolt-on (without the weld-on flange) and another 3-4 hp when used with the HRSS fuel mod on a stock sled with 2 degrees timing. This is also now known as the D&D racing "Big Mouth Y-Pipe" and includes the Y-pipe and new larger exhaust donut and a new larger Y-pipe flange. The weld-on flange does not have to be installed for a 4 hp gain- HRSS uses the y-pipe alone on stock, non-ported motors. The weld-on flange can be done at our shop by sending your pipe in. We have dyno tested various setups at Dynotech Research in November 2015 and can guide you to a great package....see our Power Up kit for the 800 ETEC.