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