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Magnaflow exhaust
I did mine about four months ago. Used the same 14" units,4" dual walled tips that were 12" long, boy did those just fit ! I had to much booming resonance inside the cabin at 1-2000 rpm with the A6 shifting automatically so I to went with the resonated x pipe and that helped alot and is more livable.Funny thing is it is quieter outside then inside, I did a slow drive by on our street and my wife could hardly hear anything at all,should be the otherway around and would be perfect! But when punching it to 6500 rpm it does sound deep and mean but not as high pitched and screaming as others do and no rasp.
You mentioned a cai for changing the sound and it does help. I have the Airaid V2 and after a week with the new tube the sound got deeper and not as boomy. Mid July and the D/T shorties will be here and hopefully gets deeper and more growl!
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