Drive magazine has a nice article on AVCS (Active Valve Control System). Says it's "available" on the 04 and 05 WRX/STi and other models. Does this mean it is stock or an "option" that I've never heard of before?
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Drive magazine has a nice article on AVCS (Active Valve Control System). Says it's "available" on the 04 and 05 WRX/STi and other models. Does this mean it is stock or an "option" that I've never heard of before?
System).
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