Alright I looked them up:
"The TRD Door Stabilizer helps stiffen the chassis of your BRZ, FR-S, or GT86 by sliding a spring loaded metal section behind the lock which grabs against a polymer based plastic piece on the door itself. This then pushes on the door and against the hinges which helps stiffens the chassis."
Really? I'd like to see someone with lap time to prove this isn't bullshit it looks cool but for $200?:
http://www.brz-parts.com/ms304-18001.html
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