For anyone contemplating doing this I just want to say it is a fairly simple conversion....actually, the hardest part is making sure the bumper cover cutouts are even and symmetrical...I purchased the Borla system from PFYC and it was all there...including the inserts...the mufflers have Borla stamped into them along with a Borla sticker if you care to use it...I didnt paint the inserts since i have a PBM and didnt want issues with possible flaking from any heat....the system fit very nicely...no issue with the hanger at the driveshaft at all....about half inch clearance...the car is a stock A4....i loved the sound of the factory system and this was a way to get the dual outlet look...i was apprehensive about possibly not liking the new sound....it is different...nice burble at idle (maybe not quite as loud as factory)....a really nice rumble about 60 cruising....and much louder when you get on it....i guess "sound" is subjective...i will run the system and let it season...i'm thinking it will get louder with some age....all in all, its pretty much what i expected....here are a coupe of pics....