There are no aftermarket DMFW. The DMFW design is for comfort, and it does an okay job at that. However it is basically acting as a damped spring in between the engine and transmission, which isn't ideal for putting power down quickly and accurately.
Keep in mind that as you lower the weight of the flywheel, taking off from a stop will require more throttle input and the engine will lose revs faster in between shifts. On the plus side the engine will spin up more "freely".
As I mentioned in the other thread, aftermarket lightweight flywheels are usually around 10-15lbs, compared to the ~25lb Subaru OEM ('06+ WRX, '07+ LGT) SMFW and the 30lb+ DMFW.
Last edited by Underdog; 02-19-2013 at 09:44 AM..