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If you're doing the rear control arms (I assume that's what you meant by links), absolutely do sealed monoball RTABs (not bimmerworlds).
ZCP steering trim is trappable, but the M track mode button won't function unless you swap in an 817.3 DSC module (ZCP/CSL module). Besides working with the button, that DSC module has less aggressive (better for track use) ABS and/or can be flashed with the software BMW used on their e46 race cars.
Those DSC modules (817.3) are pretty hard to find and stupidly expensive new. It took me over a year of searching to find one. You're probably better off just coding the DSC button to be quick tap M track mode, long press off.
Plus, that way you can keep your steering wheel controls for changing engine maps on the fly. Even with the 817.3 DSC module, I toggle M track mode using the extra button on the e39 wiper stalk, so I can keep my steering wheel controls. IMO it's nice to not have to take your hands off the steering wheel for anything other than shifting.
I've been driving and listing what will be needed to start the restoration and some upgrades on the PY.
The current list for the restoration project:
Rear link kits
Driver window seal (I read this might be a window regulator bolt that's loose?)
Rear LED light covers, trims and turn signal bulb (obviously!)
A & C pillar
Ash tray cover and radio mounting bracket
Auto dimming mirror is damaged and needs to be repaired
All interior trims
Steering wheel & ZCP wheel trim
Shift knob, booth and ebrake booth
Front seats reupholstered to M-Text (OE or Recaro PP ABE, still debating)
Paint needs to be fully corrected and edges re-cleared, sanded and polished.
I will start removing the Supercharger next week, along with the header-back magnaflow exhaust, the lightweight flywheel and race clutch and the 19" Beyern wheels. These will all be for sale.
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I have a question: can the OEM multi-function steering wheel be converted to a single button ZCP by fitting the ZCP trims? Does it require coding?
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Modifications wise, this is still up to debate and discussions. My goal is to create a classic, OEM+ sunday backroad fun car.
I'm currently thinking:
CSL front bumper, roof, trunk and diffuser
CSL center console
CSL airbox
CSL wheels reimagined in 1 piece forged
Gloss 1x1 Carbon Trims
Alcantara Touch Points
Supersprint 63.5mm complete kit with Sport Muffler & Resonated Center Section
I am debating CSL brakes or a BBK upgrade.
I am debating retrofitting an EDC type suspension. More info to come on this.
Lightweight carbon forged flywheel with OEM clutch
The oft repeated complaints are track related with respect to difficulty cooling (I'm sure there is truth), other than that everything else is subjective since as best I can tell, and feel, the power is still quite linear. HP to dollars was the decider for me when I went FI. Anecdotal of course but I'm at 9k miles on my SC and zero problems but I don't track the car.
Legitimately, people make such a bigger deal about this than they should. It has what I believe to be a Magnaflow exhaust on it right now, and it isn’t bad at all.
Exhaust sound is for by standers, I drive windows up and induction noise is my jam.
M Tex is probably a step above speed cloth. There is a different cloth interior (impulse cloth) that came if you didn't option leather, that's much crappier feeling than the M Tex... and fairly similar to the speed cloth.
Boooooo I love my Impuls seats, super comfortable IMO and wouldn’t trade them for any color leather, M-Tex is another story, that’s the grail
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