I just got my Single peice steel driveshaft from powertrain... It was $192.50 plus a $60 core (that includes shipping) According to the guy at powertrain I talked to there isnt much of a benefit that they have noticed of an Aluminum over a Steel Single peice DS. but there is a big price difference. And in my personal opinion Aluminum doesnt seem like a good material to make a DS out of. (but im not an engineer) I did notice a difference with the new DS. And as far as reliability goes, the Single peice DS is supposed to be way better then the OEM one. ----my 2 cents