I was noticing the same thing on my '09 XB12Ss...
dave_xb12r seems to think that its to prevent "stinky leg". As he complains that his left pant leg smells of exhaust occasionally. I hsve not had this problem as the outlet points backwards and away from my jeans.
Now as far as preformance goes, I have no idea how a 90 degree bend affects the final numbers...
Does it worry you that yourr exhaust isn't the 'same' an an '07 or '08?