Originally Posted by BTL
+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.
First thing I asked the previous owner after I test rode the 2010 (that I bought) was - "Is that an aftermarket exhaust?" - it did not sound anything like previous GS's (or boxers) I'd ridden before.
I'd join the choir here and suggest saving your dough - and using it instead to pay for a couple of extra long weekends - and get out and ride that thing.