rick, the pipe was eyeballed by my buddy. It was insane on his gila-derbi. Really scary powerband where it'd start all nice and torquey, then his super duper hard and wheelie all crazy. Top speed was acceptable, very similar to blue bendy metrakit pipe.
I'm hoping my super heavy bike (tires mostly) and smaller carb tame it down a tad, but I'm still expecting a strong mid-range pull.