I made mine by doing all the turning work first. Then milling the fins and drilling, tapping and c-boring the screw holes. Then I sawed them in half. it was necessary to remove the OEM heat shields. 
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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