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I was told the A6 should see about a 15% powerloss through the drivetrain. That's about what my numbers show, but with a CAI & 2.5 Corsa cat-back. Alot of cars are showing around 320rwhp and below. That kinda shows me these things need to breathe. Maybe go with a 3" exhaust and CAI.
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Ordered 11/08/08....Del. 08/05/2009 Loving every minute of it! Don't hate me because i'm Pretty.... 
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