I know 240sxmotoring.com has a special for abt $100 less than DSS offers theirs for. Note that the product offered from 240SXmotoring is from the Driveshaft shop. So it's the same product for cheaper.
I have a friend with a Z32 TT who has the aluminum one-piece. He loves it but there is a strange med-pitch whine from it for a second at certain RPM's. I can't hear it in the cabin since he installed his Greddy catalyst-back exhaust.
Hope this helps?