the law states the exhaust emissions based parts must all be present and working and tail pipe gasses must be within set limits and 02 sensors must also be working and are tested as part of gas test at mot,Hi everyone,
Apologies if this has been asked before but I was struggling for a definitive answer.
I was looking into possibly getting a replacement downpipe for my R56 Cooper S.
Am I right in thinking there are 2 cats in the exhaust system? If so is there 1 in the downpipe and 1 elsewhere?
In other words if I install a decat downpipe will it definitely fail on emissions come MOT time or is there another CAT elsewhere that will keep the emissions down?
Thanks in advance for any advice
way around it is to cut old cat up and put a straight through pipe with filter part removed or drill out the center of it, then it all looks stock, after this its down to a mapper to get the 02 sensors and what comes out of exhaust to become what the mot gass machine needs to replicate the factory fueling as such, worth speaking to black magic tuning he really good at stand alone maps and removing files from the ecu, as to run catless you will need ecu files altered so dont get limp modes and randow emission fault codes all the time,
Black Magic ECU Remapping Specialist Ltd - Unit 2, 60 Liskeard Road, Callington, Callington - Establishment and car repair