Apologies for the newbie question here but I believe that in order to fit a Milltek catback system I shall need my car mapped or coded. Can somebody please confirm what I need? Can this be easily coded via VCDS or do I need a map like Revo Stg 1?
Also, what happens to the butterfly valve controller in the tailpipe of the OEM exhaust? Is it removed completely or just zip tied to the chassis out of the way?
Thanks in advance for your help!