hi! Long story short.. im about to pull the trigger on a b8 rs4 2012. My question is sports exhaust... Its from a bmw dealership as its a trade in...they are saying it has due to valves operating using the drive select.. The car has DRC, 20's and Dynamic steering but no mention of sports exhaust. The rear exhaust tips are also silver... i understand the stock exhaust has valves as well as oem sports exhaust.. Is there any other way to tell as I have phoned Audi uk and other dealerships and can't really get a straight answer as they can't give me original spec sheet. Thanks in advance!