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2017 86, knocked out cat in OEM header.
90° mini cat ($40AU fleabay jobbie) on rear O2 sensor, no codes after 200 km of hwy and general thrashing.
Gains, losses, don't know for sure, seems better in the midrange....seems to rev much more freely.......it is better than with the cat, how much??????? F knows.
Has header back X Force exhaust, OEM overpipe.
Cold start is obnoxious loud.
Settles down on idle.
Sounds great at full noise.
Tune will fix cold start.
Should have time for a tune in a month or two.
Until then I'm an annoying prick in the mornings.
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