I just had my round-arm version of this pipe personally delivered to me last night by QuarterKick. Now that's service!!
The delivery man has this installed on his 50V as well to test it out. Need to lose the pedals (he even brought pegs for me) as well as the pedal chain, since the round arm version goes up above the swing arm. He said to make sure that it moves freely before bolting on hard, but that it works well.
There is just one little tack weld on the restrictor, I'll just grind that off and the restrictor pops right out. Looking forward to getting this on the bike in the next couple of weekends. Gotta finish up the Puchs first, then the Moby hits the table.
Thanks for the recommendation Ben. I think it'll be sweet!