I bought the M5 springs because they are more performance oriented. They are stiffer and designed for the car. Most of the guys here are cosmetics guys who are into looks rather than performance and their goal is having the tires fill the wheel wells.
HAS kits are good because they preserve suspension travel by relocating the spring on the strut. But there are a couple of options and one may be more performance oriented than another due to the spring rates.
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