do not take it off or you may fuck your engine yeh it deffo needs a change, will be hard to find a new exhaust as most road bikes are 4 stroke and you usually need a specific exhaust to suit a 2 stroke...so there will less on the market and as for taking it off....you cant, you must have a muffler with a 2 stroke of your engine will be fucked 4 stroke works like this,1 fuel in + compression,2 spark + explosion+ piston goes down = power, 3 compress again as a valve opens forcing all fumes/gas n shit out to the exhaust pipe, 4 piston comes down ready for more fuel....these are the 4 strokes of a 4 stroke a 2 stroke works like this, 1 fuel in and compression + spark + explosion = power , 2 piston comes back down ready for omre fuel and gas is released simply by back pressure from a 2 stoke exhaust system that puts massive pressure on the side of the release valve so when it opens the gas in the cylinder rush's into the exhaust pipe...these are the 2 strokes of a 2 stroke no exhaust = no pressure = not all fumes will release = piston will compress fumes and fuel = missfires and possible broken engine best thing i learned about a 4 stroke is SUCK SQUEZE BANG BLOW suck(air+ fuel in) squeze(compression) bang( ignition(spark)) blow(exhaust valve open) and 2 stroke is all on the preasure, deff needs an exhaust if there isnt backpreassure(exhaust) it will backfire every time you rev it and shoot out flames it will fuck up your engine if driven around for more than 2 days