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MOT testers vary so much as to what they consider acceptable noise levels. You may have to shop around.
I haven't had one actually measure the sound level, but when I had my Harley and tried to book it in for its test the first question was usually "Has it got the standard mufflers". When they heard my answer ("No, it has Screaming Eagle mufflers with 'Race track use only' stamped on them"), most said don't bother bringing it here, it will fail.
A lot will fail a bike that has end cans without the E mark (i.e. European type approval). You can buy E mark stickers on eBay, but I'm sure not many testers would be fooled by them!
My suggestion is to check with your local Harley dealer and see if they do MOTs or, if not, who they use to do them - they are very used to "non-standard" pipes, after all, there are very few Harleys who have the stock mufflers on them for very long!
Just an idea,
Nigel.
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