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I purchased an o2 sensor thread chaser. It is 18x1.5. I can barely get a couple turns before it becomes almost impossible to go further.
You can see from the picture how far the sensor goes before it stops too.
Suggestions? Did I get an improperly threaded header?
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2014 BRZ, SWP, OFT, Kosei K4R 17x7 with ZII SS
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