GFB T9003 BOV Respons TMS fits Subaru WRX/STI MY01-08 T9003

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  • Adjustable bias venting BOV to suit '01-current Subaru WRX Sti, WRX & XT
  • Adjust bias venting between 2 ports to control performance and sound
  • Go from atmosphere venting to recirculating BOV with the twist of a ring
  • More responsive throttle, 30% boost time improvement and classic BOV sound
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