Both are suspension mods aimed at lowering the car and sharpening how it handles, but they do it in different ways and at very different price points. Here's what actually separates a full coilover kit from a set of lowering springs, using real listed parts for a bugeye-era Impreza WRX STi as the example.
| Spec | Bilstein B14 PSS Coilover Kit | Lowering Springs (F30/R25mm) |
|---|---|---|
| What it replaces | The entire strut and spring assembly, including the damper | Just the springs, your car's original dampers stay in |
| Ride height adjustment | Fully adjustable, independently front and rear, within the kit's range | Fixed drop set by the spring, no adjustment once fitted |
| Damping | New gas dampers matched to the shorter, stiffer spring rate | Unchanged, since original dampers were tuned for the taller factory spring |
| Typical install | Full strut swap, front and rear, usually a day's work for a garage | Spring compression and swap on the existing strut, quicker and cheaper labour |
| Catalogue price | From £1,315 (Japspeed UK) | From £199.99 (Gravity Performance) |
A coilover kit is the right call if you want to set your own ride height, want damping that's actually matched to how low you're running the car, or you're building toward track use where adjustability matters. It's a bigger outlay and a bigger job to fit, but it's a complete, purpose-built suspension setup rather than a modification of the factory one.
If the goal is mainly to drop the stance and firm up the handling a bit without touching the factory dampers, a set of lowering springs does that for a fraction of the cost and labour. The trade-off is that your original dampers weren't designed for the shorter spring, so ride quality and damper lifespan can suffer if you run them for a long time. Springs are usually treated as a mod for dampers that are due for replacement soon anyway, or as a budget-first step before a coilover kit later.
Yes. Lowering springs only replace the spring itself. The strut, damper, and top mount all stay factory, which is why they're cheaper and quicker to fit than a coilover kit, but also why they're not a perfect match for the shorter, stiffer spring long-term.
No. The drop is fixed by the spring's free length: on the example above that's a 30mm front and 25mm rear drop with no further adjustment. A coilover kit is the option if you want to raise or lower the car after it's fitted.
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