OK I need a new mid section and backboxes for my A4 Sline Quattro (2005) - took it to my local exhaust garage who told me yes we can replace....turns out there supplier delivered the wrong parts as the exhaust they sent was totally different. Cutting a long story short they then proceeded to tell me that the exhaust had to be ordered directly from Audi as know one does aftermarket replacement exhaust systems for my car. Is that correct, no aftermarket suppliers stock this exhaust system? Phone Audi to get a price - £300 for the mid section and over £400 a piece for the two backboxes. Thats almost £1200 without even fitting!. Can someone please advise if there are other suppliers I can use?