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I have a very similar configuration as what you are thinking about doing. I started out with the Borla S type axle back w/ NPP (11924) and then I added on the mid-pipes (60610) which are the same as the 60607 you are looking at only mine have the AFM valves because I have the A8.
When I added on the mid pipes they, the best way to describe it is that it felt like the car could breath better, it opened things up, there was clearly better flow, the tone was a little deeper and louder.
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