Congrats! I'm thinking of dropping by SCA tonight with the BRZ if in case you decide to drop by.
To be honest.. If I had a Cayman it would be difficult to look back. FWIW so far i'm having a blast with the BRZ. Hope you're enjoying the same with the Cayman.
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The past week has been a frenzy of FR-S/BRZ coverage at SEMA. There are so many quality parts for this car it's mind boggling. As an NSX owner, I wish there was even a fraction of the same interest in our platform.
Suspension: They all have Toyobaru specific kits
JRZ
Ohlins
Suspension Tecknics (formerly Aragosta)
KW
Eibach
Greddy
Cusco
HKS
RS*R
Bilstein
Koni
(insert about 10 Taiwanese companies here)
Brakes: (this is the only segment that seems to be priced the same as the NSX market)
Wilwood
Brembo
Stoptech
Rotora
Endless
Project Mu
AP Racing
I/H/E
Maybe 30? I haven't seen too many junk parts being offered which is a relief.
Superchargers:
TRD (no pic yet)
Vortech

Innovate

Turbos:
AVO - sort of like the Comptech for the Subie world has a very nice turbo kit, fully tested in Japan and US at various temps and altitudes, intercooler, ECU, etc... for $3800 MSRP. Yes, you read that price right.

Crawford - Also has a nice turbo kit

And about 5 others..
Body Kits:
Too many from mild to wild
Pics here