>>>*We tested years ago. The results were 6-8 H/P loss from drag. The gains were from more surface area at wear points, thus longer service life.

Pull strength in reversions testing came up zero difference, there is no difference in strength. It is wear points that make the difference, and this is actually quite a bit.

If you don't like opening her up every 120,000 miles or so, which is normal single setup service then the dual roller can be a good investment.

Also a good investment if your use is severe, racing, mud running, etc. You sacrifice a few ponies for being still running at the checkered flag....*EB