buschur racing makes the udp w/ balancer but i do not believe it is worthwhile nor do i believe it will work as well as the unorthodox udp; i believe most of the gains from the udp seem to actually come from the lightened rotational mass on the crank as opposed to the actual underdriving. just my opinion, plus the buschur udp is approximately double the price, close to $400; i looked into 'em both and after much research decided to go with unorthodox's udp. it is also a very easy part to replace, pull your crank pulley and the udp goes right on there. well, good luck and safe travels.
- mike