OE BMW springs produce a ride that is both agile and comfortable, well mannered and responsive. If your vehicle has more than 100k miles, a spring replacement will certainly improve the ride quality and handling characteristics.
If you own an E46 3-Series, you're likely well aware that the factory rear coil springs are a notorious weak point. Due to the "Mini Block" barrel design and the elements, the bottom pigtails of the rear springs frequently crack and break, throwing off your alignment, causing uneven tire wear, and ruining your cornering dynamics.
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