Can't tell and honestly I'm about fed up with Torqstorm--their "kit" is not engineered the way they would like to believe and the price kind of reflects that. The belt is glazed and I think it's just too loose with one crappy spring loaded tensioner. How much load do those head units produce? 20hp each? 30hp each? 40 hp each? A single roots can eat 100hp. To think a single 8 rib can drive these things is folly IMO. J.Rob