I have an 09 XR that I will turbo some day.... Recently I found my stock primary was shot, so I thought it would be a good time to get the aftermarket Polar clutch that can hold up to a turbo. I called Stephen Payne and told him that I wanted the atac4 turbo clutch, but that I didn't have my turbo yet. He said he will set up the clutch for my type of riding and give me the ramps and weights I will need when I do turbo it, for free. I just wanted to pass along an example of great customer service.