I have an a6 3.0, so far I have gone with the APR stage 1 tune and really like it. I think I will probably go with the stage 2 1 pulley in the near future. Supposedly, the 2 pulley gives a bit more torque but also starts pushing the cooling needs towards getting an aftermarket cooler. According to the installer, if you have any thoughts at all to go stage 3, get both pulleys done at once and you will save a few hundred bucks when you go stage 3.
I went APR because after reading all the reviews here, I didn't see much negative about them, while a couple of the other tuning companies had some negative stuff. Talked with the installer and he knew what he was talking about and wasn't pushy, so I went with him and APR.
The installer recommended go stage 1, enjoy it, then decide on stage 2. He did say, 70-80% of his stage 1 installs end up going stage 2, and 50% of his stage 2 1 pulley installs end up going 2 pulleys. Stage 3 starts costing a lot for small gains I guess.
I guess I should add, I called up APR directly to find out more about the different tunes and they were great to talk to.
I did not add any exhaust stuff.
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