Quote:
Originally Posted by Tonus72
Hi
I have no idea if you could adapt it, but there are various bike systems that have an electronic butterfly valve in the exhaust system.
Many open up over about 7000 revs to free up the exhaust (as below this is probably when the db's are tested??)
Cheers
Tony
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yes i saw that some bikes have these especially Harleys specifically to quieten them down in built up areas