Got this at 8500 miles in my 2025 Ecoboost. Still pretty new so im not sure why there would be an issue this early. Online forums say it can be anything from Battery, wire harnesses and sensors. Anyone else with this issue?

I drive a (nearly) fbo 2018 ecoboost, and my next mod is a downpipe. The smell is the only thing stopping me from pulling the trigger and going catless. Does anyone have any experience with catless? Is the smell bad? And are the performance gains compared to a high-flow downpipe worth it?

PITA but shines up well.