We have now released our KTR 3" decat pipe for the Megane 4 RS 280 model. It is made from 3" bore stainless steel and it is a direct replacement for the original restrictive catalytic converter.
Once fitted you will find that boost builds quicker and the car pulls much harder through the rev range and the exhaust note also takes on a more purposeful growl which sounds superb.
We would recommend have the car mapped or the ecu program adjusted once the cat is fitted. You will also not pass an emissions test with this part installed and you will have your emissions light come on for now but this can be switched off as part of a remap.
Please note this down pipe will NOT fit GPF models.
See our exhaust warranty conditions here