JT ....Performance isn't a primary goal. I'm interested in reliability, comfort and low frequency of maintenance. 8 to 10 extra horsepower is always nice. However, I don't want to replace belts every 30 hours or even every few hundred hours like I've done so far. My typical gross weight is likely below 3250 pounds even with the two small dogs. I'm transitioning from a small light stock RZR 900 2 seater that I never replaced a belt in for 9 years. Tires would always spin before belt would slip. In Winter I ride between 2500 and 5000 feet. In Summer between 4200 and up over 10000 feet on occasion. Also, I gave up weekend mechanic activities years ago. The new stock Polaris replacement belt seems to grab at earlier RPM's and doesn't provide the super smooth start the original stock belt did. I'm thinking that I'll test drive it a bit including keeping it in low gear and often in 4 wheel when below 15 mph regardless of driving surface/incline. Allow time for new belt to break in before I romp on it. Evaluate belt burn for a ride or two. It's not clear exactly how one, two or 4 wheel drive modes interact with ECU and possible but not probable belt spin other than what we've discussed already. Further Standard vs Sport vs Comfort suspension mode may interact with belt spin if at all. I tend to leave it in the comfort setting under the theory I want comfort over performance but don't have any knowledge of exactly how it works. Before I upgrade to third party Clutch and possibly performance ECU ... I'm wondering why you and your brother made that transition from the stock components?