I think they're more than 20% stronger/stiffer, more like 50%. I installed them about 8,000 miles ago. And I've loved them for every bit of it. It helps give some road feedback as in what the suspension up front is actually doing.
I have quite a few 034 Motorsports parts on my car. The most recent of which is the strut mounts. It REALLY helped tighten up the steering. It was very subtle, it took me almost 300-400 miles (the vast majority of that was highway driving) before I finally noticed it. Once I did notice though, it clicked right away with a "WOW! What an improvement" when thinking back on the stock units. A lot of people "cheap out," and go with other companies parts for various things. But given my experience with ever part so far, if 034 makes it for the car, and it's a part I want, that's who I'm buying from.
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