I have ran the r6 rear for about two years now and has held up pretty well. I don't FT or do any ice racing but I have a 421 cub and it helps tremendously keep the front end down with the stock swinger. Even though I wouldn't recommend it, I ride open trails,drag and mild hillclimbs also to give you a picture of what it's been through. However, the stock shock bolts wont fit the r6. You either have to buy some from ebay or have a machinist make you some bushings so the stock shock bolts will mount with the r6 bushings.