Polaris, 440 PRO X All Snowmobiles >>> Snowmobiles by Polaris More details and ordering info. Snow Cross fantasy anyone? The Indy 440 Pro X Fan is race ready with its hi-output 440-cylinder reed assist engine and our Pro X chassis, which includes our Controlled Roll Center design up front to grab harder in the corners, and new race proven aluminum bodied gas shocks. It sports a rear suspension with shocks and springs calibrated for competitive snow cross riding including an external compression adjustable rear track gas shock and our EDGE? racing seat. Other standard features include tunnel wear strip protectors, hood screens, composite skis and racer styled handlebars and footrest placement. User input on 440 PRO X by Polaris: Be the first to submit input on this product Submit Input: Your Name: Write or Paste Input here: Upload picture:      Review Guidelines