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This means peak boost is achieved earlier in the RPM range and maintained for longer as the RPMs climb
front or rear fenders
Locknut secures boost setting
No drilling required
the Essentials Kit takes a proactive approach -- refresh all the high-priority positions at once and start with a clean baseline
GrimmSpeed Strut Bar (Black) - 2015-2021 Subaru WRX / STI prop65_reproductive This means peak boost isSharper Turn In, Less Body Roll Starting With the Strut Bar The GrimmSpeed Strut Bar in Black for the 2015 2021 Subaru WRX STI is a triangulated aluminum chassis brace that connects the front strut towers, reducing lateral chassis flex under hard cornering. The result is more consistent front suspension geometry through corners, sharper turn in response, and more predictable handling balance on the VA WRX STI. Bolt in at factory strut tower mounting
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