Start with wheels. I would choose forged 18" rims rather than 19" reps. You might want a summer/track set and a winter set. Good tires make a big difference, but they wear out.
I like the BMW Perf kit -- but I liked the price of the old one better.
On a budget I would try and find some good used wheels, Koni yellows or fsds, and BMW Perf springs. And DIY.
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