I know Top Secret made a dry sump oil system for their widebody Supra that uses the Toyota 3SGTE motor (not even as popular as the RB or 2JZ). You should probably ask Top Secret if they have one for the Z yet since they have done a lot of work to their widebody 350Z.
These people http://www.drysump.com/pan16a.htm do this but i am unreliably informed that it is for the 3.0 l and the bolt patern and crank clearance may not be 350z compatible.
Am planing to use Pace slim jim pump bolted up to the Aircon mounting boss.
Should add that i am UK based
Lola do one for their SR2 sports racer that includes a lower bearing cage but last time i asked a used refurbred one was 12K, a little steep i think
A forum community dedicated to Nissan 350Z / 370Z and Infiniti G35 / G37 owners and enthusiasts. Come join the discussion about performance, modifications, troubleshooting, exhaust, turbos, maintenance, and more!