Agree with most of that Doc, although I'm led to believe that the turboed cars benefit more from a full decat as the NA engines seem to need to bit of back pressure to operate at peak performance, hence why I went with 100 cell Milltek downpipes on the B6 S4.
I could of course be talking completely out of my bottom... 
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Present: S4 B8 avant, fully loaded, MRC Stage2, Milltek non-res, KW springs
Past: S8 D2 FL, S2 ABY coupe, RS6 C5 saloon, RS4 B7 saloon, S4 B5 saloon, S4 B6 avant, all gone but not forgotten 
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