If you want to get that last one-onethousandth of a second, the lighter underdriven pulley might get it for you. The DMD might cost you 0.001 second. But, for a streetable car, the DMD is reported to make the engine feel much better at high revs.
In other words, it's not a big deal. Don't sweat power. Going to Falken Azenis over the BFGs would be worth a lot more times. If you like the idea of a smother-revving engine, then go ahead and get a DMD. It won't cost you any real time.
