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Are they road legal (stamped) with the baffles in and how much would you be hoping for?

I don't think road legal ones are stamped anymore, since the advent of removable baffles. I think they're stamped "mot for road use" if they are illegal.

Here you go, 2004 it all changed. This is from MCN



Until May 2004 MoT testers used to have to look for a British Standard (BS) or E-mark on an exhaust. At the time increasing numbers of imported bikes were passing Single Vehicle Type Approval which includes a noise meter test, but doesn't require any markings, then failing MoTs because they didn't have the necessary marks.

So there was a big update to the regulations in 2004 and now a tester has to look for unacceptable marks like "race use only" or "not for road use".

In the absence of them he won't wield an expensive noise meter to check the pipe, instead, according to the MoT test manual section 7.1 he has to do this: “With the engine running assess the effectiveness of the silencer(s) in reducing as far as is reasonable the noise emitted.”

Never had any problems passing an MOT - I'm not aware that they have any Type Approval marks on them. Reserve is £50 but I'm hoping to see £100.