I recently made this buying decision and I'd like to share some info on the main difference between the two models.
While the 94V is a higher speed and load rating, this results in a much firmer sidewall. As a result of the firmer sidewall, this tire will give a harsher ride over bumps and pavement seems. It will also apply more force to the wheel during a hard impact. The higher load rating will also be a bit louder and create some resonating sounds at specific speeds.
The 91H is well within the load rating of the B5 S4 and the H rating is good up to 130MPH.
On my A6, I had the choice of 2 LM25 tires with ratings of 94H and 97V. Since the A6 is heavier, the 94 load rating is the minimum.
I have driven my LM25 94H up to 120MPH so far and they are extremely quiet and safe.
Last year I ran the Dunlop Winter Sport 3D with a load rating of 97V and the ride was very rough over bumps and made much more noise between 80-85MPH. I also ended up with 4 bent wheels at the end of the winter season.
As a few have mentioned, the need for a 149MPH winter tire is pretty low. 130MPH is a good limit for winter driving. Honestly, the fastest I've ever driven on a highway in 3-4" of snow is about 75MPH so, 130MPH is well within my snow driving needs.
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