Has anybody ever changed the current OEM Header and Exhaust setup on the F800GS to a 2 into 2 setup? Does anybody know how to change the exhaust on the F800GS to give it a beat opposed to a growl? Would the engine work with a 2 into 2 setup? Advantages/disadvanted please from anybody. Is there anyway changing the exhausts that you could get a similar sound that you get from the KTM990? Thanks.