I am rebuilding a 1978 280Z and was planning all along to pretty much buy all of the suspension items available from T3, minus perhaps the coilovers since I wanted to go with BG Racing. I want to do a 2JZ swap with maybe a Z32 transmission and want it to be a fun street car. I will not be doing any drag racing or drifting as I do not want to beat the crap out of the car after all the work I will be doing restoring it. Recently I met a gentleman who had the S13 subframe installed and who claimed I couldn't go wrong with either set up but that the S13 subframe would give me way more options for upgrades as well as flexibility and adjustability. He also claimed it would be cheaper, unless I had to pay a shop to do the labor, which I would since I do not know how to weld.
I contacted 2 companies that sell suspension items for the S30 and asked them their opinion on the pros/cons of the S13 subframe vs T3 stuff. This was their response:
"As far as I know, there is no mount kit for putting a complete S13 subframe under the car.....for good reason. The S13 subframe is fairly complex, yet poor handling design. The multi-link rear suspension is an inherently loose system. This is why they are such good drift cars, but rarely ever seen in road race.