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Derbi Exhausts Mulhacen 659

Super cool styling and agile handling make this a great city bike or back lane scratcher. The standard set up tends towards the bike being lean on the fuel mixture. It is possible to fit a GPR exhaust with no further modifications but to get the best we would also suggest fitting one of our Multilevel fuel controllers or having the ecu re-mapped. This advice is true for all aftermarket exhausts.