Just picked up a pair of 3" Downpipes from SpecialtyZ and was wondering if there has been any update regarding O2 sensors. Specifically, 1.) Do they need to be replaced? Per Robo's site, this is the time to buy new oxygen sensors to replace the old ones. Is this just for convenience since they're already out or is there a performance/functional purpose in doing so? 2.) If so, any consensus/confirmation on using Bosch #13091? Searched and found related posts but they're a bit dated and have mixed reviews. "the only difference on the OEM is where the clip is" "I've had customers with the Bosch have issues" TIA
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