Stock tips on my 2011 Avant, Part No. says 8K0 253 825 H, same part number for both left and right sides. These came already installed on my car but I believe you just twist them to align one of the two inlet notches to the bottom center to get the right angle, these just simply slip on. They are approximately 3.5" diameter:
If considering aftermarket stainless steel tips, I would go with Magnaflow Part No. 35121, 20-degree angle cut double wall, 4" diameter, 7" long, 2.25" inlet, and have a local muffler shop weld them on. Here's what they look like on my 2008 Passat 3.6 4motion just to give some idea what the tips look like:
For the rolled round edge (stock tip style), Magnaflow has Part No. 35177 but with a slightly less 15-degree cut than my 20-degree cut above. The angle that would work better in my opinion would be closer to 30-degrees to match the angle of the valence, but they don't have one that's the right length, the other tips they have with the 30-degree angle are too long unless you want to also ditch the stock muffler.
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