Modified or not does not affect the DME update. My car was modified (P700 with PI) and my dealership did the recall without any issues. Took them a few flash attempts but they got my recall work done with the locked DME (expected) and CarPlay update.
Took my DME to get it unlocked and had my...
Factory fill is BMW TwinPower 0w-20. I ran BMW TwinPower 5w-30 and now Liqui Moly 5w-30.
Brake fluid is just DOT 4 based fluid. If you want something better than factory for more agressive driving (e.g., track days), then Castrol SRF or something similar is best.
I'll have to ask the shop who did the install but there are a whole bunch of fittings (mostly a whole lot of AN fittings of various degrees). as well since I did my manifold as well.
The fuel kit from Radium Engineering is what I run.
20-0760 Fuel Pump Hanger, MK5 Supra - ($399.95)
20-0761-05 Fuel Hanger Plumbing Kit, MK Supra, Microglass - ($479.95) or 20-0761-03 Fuel Hanger Plumbing Kit, MK Supra, Stainless - ($499.95)
Those are the minimum to get you going. If you...
You can, just buy the Radium fuel hat, the fuel regulator, fuel filter, and a surge tank (http://www.radiumauto.com/Fuel-Surge-Tank-for-External-Pumps-P272.aspx).
I have a Samsung T7 1TB SSD and it works fine. Inital library sync is slower the more files you have but it works. I have it formatted in exFAT and all makes no difference the file size. Just make sure the files are in the format that the iDrive unit can read (e.g., FLAC, AVI, etc.).
Recall flash work done on any Supra will lock the DME. It will give you full screen Apple CarPlay.
If you are a pre-06/2020 and you were unlocked and/or tuned, you now are locked again and will require a bench unlock to flash your DME with an aftermarket tune.
If you are a post-06/2020, then...