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Ducati Meccanica
Posts: 2,527
Join Date: Sep 2004
Location: Pulborough, W. Sussex
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If its a 748, then anything over 45mm gives a mid-range hole that 'chipping' wont fix.
If you just want to rev it and get more top-end then any 50's and a chip will be fine.
This is not particular to ducs - its a volume-of-gas thing that affects any bike. 'Over-exhaust' an engine and you'll lose midrange.