A bigger header pipe won't affect the noise level, so it wouldn't fail an MoT. That's why silencers have CE markings and header pipes don't. I have the Motad headers. They were a straight swap for the originals, including the heat shield plate, and fitted straight onto the silencer. They went from bright steel to copper-colour in about 10 minutes of idling (suggesting the s/s isn't very high quality), but I don't mind that. I'm well pleased with them.
|