So, I just got the ECS H Pipe installed & I'm very impressed. Before I purchased it I read "Best $300 bang for the buck for the RS4" & I can't agree more. I wanted a little sound, but not too much & this is exactly what it delivers. There's also a more noticeable difference when in sport mode. It cost me $50 to get installed at my local muffler shop. There were 2 cuts to get the stock resonators off and then this pipe bolts right on in less than 20 minutes. I had to bring it back once to get the tips re-aligned, but I guess that's expected.

The only problem now is that the little bit of extra sound is making me want the Milltek non-res even more. :)

Milltek NON RES is the ONLY way to go, my friend.