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+1 on the stock halfshafts as John mentioned. These things are shockingly resilient. Greg IRA won two national road racing championships with 100% OEM half-shafts. I still don’t quite understand how these U-joints last so long without being serviceable or an obvious means to keep them lubed. in theory, CV’s will gain you back ~2% drivetrain parasitic loss thanks to the “constant velocity” component (why else are they called CV’s), but I’m not aware of anyone who has done a side-by-side dyno test specifically in a Z. Too bad about Fritz getting out of the game. I don’t blame him. It is really, really hard to turn a profit with these low-volume manufactured parts. There really isn’t an inexpensive way to make them in low volume and still have decent quality. T3 and Apex are all the rage thanks to good marketing, but their parts are fairly inexpensive to make. I can find many of their components on McMaster-carr, and the rest is just fabrication, CNC, water jet, etc. not knocking them, just pointing out why it’s so hard to make reasonably priced rotating equipment.