Reply To: Cat delete, adjust fueling?


I might very well be misinformed, but I’ve read in another forum full of people that seemed to know a lot about engines – or at least they used a lot of difficult words 🙂 – that the O2 sensor only adjust fuel trim on idle and on low revs. So on mid/high revs the O2 sensor won’t help, and you risk damaging the engine. The conclusion there was that no new mapping is necessary if you only change slip-on, but if you remove cat or mixture with the air intake, new mapping is highly recommended.