[Sterndotstern]

Hi all! I'm a new ti owner and so far I have been utterly charmed by the combination of short gears, quick revs, and willing handling. After taking a multi-year hiatus from the race track, I'm feeling the itch again. I am not a novice driver and I consider safety and reliability the top two "performance upgrades" for the race track.

That said, my car needs to catch up on maintenance. Assuming you had no maintenance records for a car, what is the minimal subset of repairs/upgrades/maintenance to consider a car safe and reliable at 10/10ths driving. I would prefer to have most of these installed for me as I do not have a lift or press at home, but I've done a lot of DIY work on past cars. If there are any "while you're in there, might as well..." items I'm very much open to suggestions. For instance, it seems that upgrading to an E30 LSD diff would make sense to do at the same time as doing the subframe/diff bushings.

For the chassis, I would expect that most of the rubber on the car would need replacement at this point (the car is a '98):
Suspension Parts
- rear shock mounts -- 33-52-1-092-362 -- $35
- front control arm bushings (pre-pressed) -- 31-12-1-136-531 and -532 -- $70
- rear subframe bushings -- 33-31-1-090-946 -- $25
- rear control arm bushings? Worth the hassle? -- $20
- differential mount bushings? -- 33-17-1-134-871 -- $20

Suspension Total: $170 + labor

The prices come from online retailers for OEM-equivalent parts.

I'm interested in the differences between urethane/delrin and rubber bushings as well, if anyone has direct street and track experience with both. Is the added expense worth it?

The plastic in the cooling system, like all BMWs, seems to be a weak point. On the M44, I understand there are some very tricky coolant passages to be replaced. Hopefully this is a complete list of what should be replaced to avoid any cooling system failures on track.
Cooling System Parts
- Water Connector (back of the head) -- 11-53-1-743-679 -- $7
- Water Pipe (not a bong) -- 11-53-1-714-738 -- $17
- Thermostat & Housing -- 11-53-1-743-017 -- $51
- Water Pump -- 11-51-0-393-338 -- $48
- Radiator -- 17-11-1-728-907 -- $171
- Accessory Belts -- 11-28-1-437-369 & 11-28-1-743-193 -- $31
- Hoses & Clamps: $60 or so
11-53-1-247-261 -- $11
11-53-1-247-398 -- $11
11-53-1-743-295 -- $17
11-53-1-743-535 -- $17

Cooling System Total: $214 plus Radiator (optional)

Those are the two main areas of concern for me. Anything else I'm missing or should consider?

Edit: based on the feedback below, my shopping list has grown to include a few more pieces.

Misc
- Engine Mounts -- 11-81-1-141-377 -- $102
- Transmission Mounts -- 22-31-6-771-220 - $24
- Fuel Filter -- 13-32-1-740-985 -- $15

Misc Total: $141
This is really good feeback. Thanks guys!