We do not need your Assembly Number to tell you what she needs, and 129983 matches as a late 02. Upgrading all those parts to HGTC is prohibitively expensive and the HGTC Shock ECU will not work without a suspension lamp and the F1 ECU/TCU will likely require two very expensive new Motronic ECUs before it will work.
HGTC shocks came with all new mount hardware and bushings and between the shocks and mounts, you would be better off buying a Moton two way suspension than trying to buy and install all those parts.
If I were you, here is what I would do:
1) buy an FHP steering ECU from John at the Skunkworks, just a straight one, not one that is hooked up through the Sport switch
2) check your shock absorber ECU under the cheek carpet panel on the passenger side and if it is 183960, replace it with 201673 or 201674
Note these two changes above may be enough for you, if not:
3) have a set of FHP springs manufactured using the specs above, we do not have HGTC spring specs
4) have a 21 mm anti-roll bar manufactured, buy the 21 mm bushings from Ricambi
If not already done, replace the center muffler/resonator with straight pipes.
If your heart is set on HGTC, trade your car on one. Way cheaper than trying to upgrade.
Or buy an HGTC kit from your dealer for around $25-35K.
Read through the 575 Technical Thread. All the HGTC parts numbers and FHP parts numbers are in that thread, but many are NLA.
Thanks for all the detailed info Terry (Taz). I have a few more questions if you don't mind answering:
1. If I buy the straight FHP steering ECU from at the Skunkworks (you wouldn't happen to have his web address so I can contact, would you?), and as you say, not the one hooked up to the Sport Switch, does that mean that the Sport Switch will no longer function? Or will it only work with other parts of the car with the exception of the steering?
2. I have Tubi's installed on the car, is that not effectively equivalent to adding straight pipes? If not, does X-Ost offer straight pipes as I know the dealer I deal with sells offers X-ost parts?
I don't think I have the money nor would I be interested in going full bore HGTC (I wouldn't want the ceramic brakes for example), I'm just interested in some good bits. Btw, Maranello Motors (the official Ferrari dealer here in Toronto), told me the cost for the HGTC kit and install is CDN$45,000.00 (more than I want to spend).
Lastly, other than going to a ceramic brake set-up, are there any brake improvement alternatives for the 575? I like seeing the Ferrari blazoned rotors on my wheels, but I'm not satisfied with the brake performance