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I also go through the rear 02 sensors 2 times a year. I figured mine was because the turbo though.
Os your header cattless? If you arent using it for emissions you could try a spacer to back it out of the exhaust flow to prolong its life.
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//2013 World Rally Blue BRZ Limited FBM Turbo--gone
//2018 Crystal White Pearl BRZ Ts 2.2l Harrop Supercharged
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