As the 2013 season winds down, I wanted to drop you a note of thanks and mention how satisfied my riding buddy Mike and I are with the 670 dual ring piston rebuild we implemented on our 500ss engines along with your billet heads.
Our 500ss engines have never sounded or performed better ...it was a little extra work, shimming the cyls/deck height, but at this point I'm very pleased with the results. We started slow, way on the fat side ... our mpg is currently what I would call safe @ 13-14ish, but now near the end of the snow season in Maine, both sleds run awesome!

I thought that I would send you a quick message thanking you for the great sales advice and product when I purchased my new Wossner produced pistons for my ’13 Polaris Switchback 800cc last fall. We had a short 6 week season here in Eastern Ontario, Canada but I enjoyed every mile (3200) on the new pistons. What a difference in performance over the OEM pistons. I followed your break-in advice and adding extra 2 smoke oil to the 91+ fuel on fill ups, plus following your warm up procedure instructions. This has been the best investment that i have made for my sled and cannot wait for ‘15-‘16 snowmobile season.