350_Jer Posted January 22, 2018 Share Posted January 22, 2018 If your car has had a remap with decats fitted and the rear lambda sensors turned off, then would it do any harm to the engine by refitting the cats for MOT time and for trackdays with quiet noise limits? I know you can get silenced decats but just thought it would be easier (and cheaper) just putting the cats back in when required as long as it won't do any harm. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted January 27, 2018 Share Posted January 27, 2018 Re fitting the original cats won't make a big difference, however for MOTs it could result in the AFRs going a bit rich and pushing the limits of failure. Quote Link to comment Share on other sites More sharing options...
350_Jer Posted February 4, 2018 Author Share Posted February 4, 2018 Hadn't thought about that, thank you! Quote Link to comment Share on other sites More sharing options...
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