Since I have an E93 with Sport, this isn't apples to apples, but I changed my front arms to M3 components at the same time I replaced OEM shocks with Koni FSDs.
The difference in steering response and feel was like night and day. If I were to buy another 335i, changing out the front arms to M3 bits, would be the first thing I would do.
But note that I focus a lot on steering response and directness - experiencing all the road irregularities thru the steering wheel is not to everyone's taste.
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-Brian
~199K miles. I -still- don't fear my 335i.
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