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2023 Jeep Gladiator Rubicon 6spd, 2019 Mustang Bullitt
15,412 Posts
tuners dont mess with emissions stuff because they can get in legal trouble. see harley davidson screaming eagle tune fiasco.
Ummm all tuners turn off the rear O2 sensor with a full tune or an ots stage 3 tune. You have to request for it to be turned on last time i checked.

Which is due to the nature of aftermarket downpipes, either catless or high flow thus causing the emissions code.
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