I have the m-sport package, so don't know if the air ducting for the package was different in my case. I will not be visiting the dyno cstavaru, but thank you for your dynos, they were appreciated. For me, it is just more fun on the autobahn and there is more power to use. I am not sure that the performance exhaust would provide any advantage either, but sounds good! Pics of performance exhaust below also, I think this is a good upgrade.
*if you do get the exhaust, it seems to hang low by default, they have to bend the last hangers up to reduce the gap and provide a stock look