Thanks, Dmitriy. I've heard a couple of Milltek installs and think the downpipes and high-flow cats make a big difference but I'm looking to do only cat-back and the Milltek cat-back just doesn't do it for me. I'm down to choosing between the RS6 setup and the cat-backs from Sportec and Cargraphic.

'08 S4 Sedan - Deep Sea Blue/Silver/CF (6800 miles)
'03 S6 Avant - Goodwood Green/Paddles/Nav+ (68k miles)
'87 BMW L6 - Cirrus Blau/Lotus (235k miles) LOOKING FOR A NEW HOME