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The B&B Bullets sound awesome , but they droned too much for me in my previous 2005 automatic C6 A4/3.15.
With the manual you will be able to shift around the drone, nothing gets you more thumbs up then passing somebody with the Bullets on your C6.
I'd skip the x-pipe.
I currently have Borla Stingers on my 2006 C6 Vert manual tranny, the x-pipe is not necessary and cuts down on those great pops and burbles.
The Borlas sound like the Bullets, but not as loud.
You don't need the xpipe, get ready for lots of smiles and looks when you are driving around. I smile the entire time I am driving. good luck putting them on, spray the slip joint between the muffler and the hpipe with some wd-40 to help get them apart, I couldn't get mine apart till I sprayed it.