Xtreme Performance Center

RMX Sled Engine Packages

Welcome to the state-of-the-art in high altitude setup, Rocky Mountain Xtreme Kits from Xtreme Performance Center, Inc. Our RMX kits are developed for anyone who rides in Colorado at high elevations. These kits are not about ultimate horsepower or the ultimate high mark - they're about great driveability, superior fuel economy, and reliability. Click here to read more about how we test.

Current Availability:

Kits are currently available for:

2005-2006 Arctic Cat M7 twin engines

2007-2008 Arctic Cat M8 twin engines

2007-2008 Arctic Cat M1000 twin engines ('08 kits coming soon)

1997-2001 Polaris 600, 700 & 800 twin Non-VES engines

2002-2005 Polaris 700 & 800 VES engines

2006-2008 Polaris 600HO VES engines

2005-2006 Polaris 900 Liberty engines

2007-2008 Polaris 700 VES "small block" engines

2008 Polaris 800 VES "small block" engine (coming soon)

2001-2002 Ski-Doo 800 twin engines

2003-2006 Ski-Doo 800HO twin engines

2007-2008 Ski-Doo 800R twin engines ('08 kits coming soon)

The Problem: Snowmobile engines, like most powerplants, are developed to perform well at sea-level. Unfortunately, we don�t have the luxury of that much air at 10,000 feet and actually are suffering from a 30-35% loss of horsepower. While the top end horsepower loss is bad, the loss of throttle response is even worse. Our super-responsive and very torquey twins simply don�t deliver their full potential at altitude.

The Solution: First, at altitude, nothing beats compression so the basis of any RMX kit is an Xtreme modified high compression head. From there, we add a combination of pipe modifications, timing changes, canisters, fuel injection controllers, etc. that delivers the best bang for your buck. The kits are always designed to recapture throttle response and provide much better bottom end with more horsepower on top end. The kits add between three and fourteen horsepower. The head change provides the basis for throttle response while the other components generally increase top end horsepower. Generally, we also strive to have a much broader power curve at peak RPM, which making the clutching more forgiving and means the engine will run well in a variety of conditions.

The Benefits:
� Great throttle response: Breathe on the throttle and it�s gone!

� Crisper running: Compression cures any lean sports in the carburetion or fuel injection calibration.
� Better Mileage: Crisper throttle response means less time spent burning excess gas.

� More top end: More power means more speed.

� Easier to Ride: The powerband is much broader, which makes it much easier to moderate the throttle in deep snow and tight situations to avoid trenching.

Who is it for?
RMX kits are designed to be our most user friendly performance enhancing options. Essentially, anyone who owns a snowmobile will like and benefit from the performance of these kits. The intent of these kits was never to build peaky, pipey, high RPM sleds, but rather ultra-responsive, easier to ride, more fuel efficient snowmobiles.

What are the drawbacks?
The kit was developed to be used above 8000 feet. If you plan to ride below that on a regular basis, we recommend you have two sets of heads that can be changed for frequent altitude changes. Also, you�ll have to use premium 91 octane fuel with the increased compression. Other than that, there are no trade-offs or drawbacks.

Price:

RMX kits vary from $450 - $1100 installed depending on the model. If you're interested in buying a kit without having our technicians install it, please call or e-mail for more information.