Some ideas...
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commented on "Catalytic Converter Eliminators"
http://www.storminbikes.co.nz/gallery/Catalytic%2BConverter%2BEliminator/catalytic-converter-eliminators/147071?view=jumbo&order=name
Exhaust Pipework sections to remove Cat Conveters
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commented on "Triumph Catalytic Eliminator"
http://www.storminbikes.co.nz/gallery/Catalytic%2BConverter%2BEliminator/triumph-catalytic-eliminator/494159?view=jumbo&order=name
Bonny Thruxton etc models