OEM STI Pinks will be available for the USDM market for 2017-2018 BRZ's, but they are not designed to be used on BRZ Limited with Performance Package or the BRZ tS.
Subaru BRZ STI Performance Springs
Part Number: B2010CA000
STI springs are stiffer than stock springs and lower the vehicle's ride height by about 10mm. The lower center of gravity can reduce body roll and result in improved handling.
Quote:
Originally Posted by Veloist
Turns out these are most likely not compatible with the Sachs dampers of both the PP and tS. The ‘18 BRZ catalog states they are not applicable to these cars.

|