Back in mid-April 2023 I took delivery of a new 2023 S5 Sportback. I modified the car from the start with 20" dia x 10" wide Avant Garde M580 wheels and Michelin Pilot Sport AS4 275/30-20 all season tires (decided to forego winter/summer tires based on my experience with my previous 2014 S4).
Prior to the Audi's delivery, during its spring sale, I bought a thicker rear anti sway bar, front strut brace, and transmission mount from 034 Motorsports. Last week I finally had all three installed. I wanted to wait and drive the car for a while so I could more accurately assess the difference the mods made.
Here are my observations, FWIW.
Sway bar: car corners slightly flatter and with a bit less understeer. It's only noticeable during hard cornering, but it's very nice. No noticeable degradation in ride quality.
Strut Brace: The improvement in steering feel and precision from the strut brace is barely detectable, but it is there if you look for it.
Transmission Mount: The transmission mount was a shocker. The transmission shifts are clearly crisper and there is noticeably less slop when shifting, particularly in sport mode. This pretty much confirms what many others have posted on this forum about the transmission mount change.
Overall, I'm quite happy with the mods and would highly recommend them.
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