Royal Purple XPR 10w-40

Anyone ever use Royal Purple XPR 10w-40, extreme preformance racing?

Yes. We use it in our two methanol burning small blocks, one 355" and one 397" - both dirt modified motors.

Thanks, I've heard of it being used a lot in racing, modifieds and 410 sprints. This is being used in a 03 GSXR 750 for an asphalt 3/4 midget. Does anyone have any experience using this in their bike engine? Thanks.