Just an update to keep things current and because I am bored. The weight reduction is very evident when driving, and between that and the suspension changes it corners on the street way better than stock. My only autox time for comparison next year is a 19.99 on Lime Rock's lower autocross course from October:
https://limerock.com/sites/default/files/2020 Autocross Standings 10.26 FINAL V2.pdf
That was all stock with the Ford Performance tune and the GT performance pack wheels and tires (Michelin PS4S 255 front and 275 rear). I hope 2021 seat time, much wider and lighter wheels w/stickier rubber, weight reduction, and my suspension changes will let me shave at least 1 second and possibly get into their 2021 Invitational Shootout. It's a big IF, but I don't think it's out of the question.
Installed/Ready:
Cobb AccessPort with PD Tuning protune
CVF Race intercooler
RTR Chin spoiler
Lethal Performance upper/lower grille delete
XXR 521 wheels, 20x10.5 square, 285/35R20 Bridgestone RE71-R (ready, initial race set for seat time, ~31lbs each, 2-3lbs savings over the stock PP wheels I was running)
Verde V39 Parallax 20x10 / 20x11 with 275/35 and 305/35 Cooper RS3-G1 all season tires (installed, street set, wheels are ~31lbs each not that it matters)
APEX 18x11 EC-7s +52 in silver, no tires yet (appx 23lbs each)
SVE 19x11 SP2 +50 in bronze, no tires yet (appx 24.5lbs each)
Steeda camber plates
Steeda rear adjustable camber arms
Steeda rear subframe alignment inserts and bushing supports
Steeda Ultralite linear rate lowering springs
Eibach adjustable front sway bar end links
Steeda bumpsteer kit
Steeda front control arms lateral to fix roll center
Steeda front control arms tension with spherical bearings
Steeda IRS bushings and hardware (red poly)
Steeda MT-82 bushing insert
Steeda shifter support bracket/bushing
Steeda extreme g-trac brace (had it on my other S550, sold that car, figured why not...)
Baer Eradispeed front rotors (saves 8lbs)
Tomei Titanium Extreme Exhaust (saves 45.2lbs!!!)
Ford Performance short throw shifter for the MT-82
ARP 1" longer front wheel studs
OP Mustang 28mm spacers, Steeda 25 and 20mm spacers, Eibach 15mm spacers (i can make lots of things fit)
Rear seat delete (saves ~30 lbs)
Antigravity ATX30 battery (saves 20+lbs), ready... not installed, car is outside, will install in Spring
Removed engine cover
Removed underhood liner
Owned, to be installed:
Stock GT350 rear underbody panel
Precision Turbo NX2 with Turbosmart Wastegate
Airaid intake tube for use with NX2 turbo
UPR dual valve catch can
CVF Aluminum charge pipes
CVF catted 3" high flow downpipe
Snow Performance Stage 2.5 Methanol Injection Kit (not sure if I will end up using this at events, TBD)
Planned/Desired, not yet purchased:
Adjustable front sway bar, tbd rear
Adjustable coilovers for dialing in damping and spring rates
Stock GT350 rear diffuser (if needed to match up with the GT350 rear underbody panel)
Stock GT PP front underbody panel - longer, better contours for brake cooling
Rear spherical bearings
LOTS of seat time for 2021 starting at SCDA Autocross/skid pad event at Lime Rock on 3/27
Other weight reduction:
Remove trunk subwoofer for events