Originally Posted by Night Goat
I would head this advise. I worked in the service department of a BMW/Triumph dealership for 5 years. More times than I can count folks would get a killer new bike and straight away "make it better" with this and that, i.e. aftermarket exhaust, CPU modifications, etc... And more times than I can count a stock bike would wipe the floor with the modded bikes.
+1..Most aftermarket exhausts, not all, do very little with respect to horsepower and torque gains. The added benefit of a little weight reduction certainly does not justify the expense nor the headaches down the road. The 2010 and beyond GS exhaust sounds awesome.