Audi B5 S4 Coilovers Compared: KW vs ST (2000-2002)

The best Audi B5 S4 coilovers turn a 25-year-old 2.7T quattro from a soft-riding executive sedan into a flat, planted back road weapon — and the three kits we stock for the 2000–2002 S4 (chassis 8D) cover every budget from a street-friendly first upgrade to a fully track-adjustable setup. This head-to-head compares the ST X, the KW Variant 1 and the KW Variant 3 on damping adjustment, ride-height range, build quality and price so you can match the kit to how you actually drive your B5 S4.

Why the 2000-2002 Audi S4 (B5) Needs Coilovers

The B5 S4 needs new suspension because its original twin-tube dampers are two decades past their service life, leaving the car floaty over dips and vague through corners. The US-market 2000–2002 S4 pairs a 250-horsepower, 258 lb-ft twin-turbo 2.7-liter V6 (the legendary "2.7T" biturbo) with quattro all-wheel drive and a roughly 3,594 lb curb weight on the sedan. That is a lot of nose-heavy mass riding on soft factory springs and worn shocks, and it shows up as brake dive, body roll and a ride height that sits too tall in the arches.

A coilover kit solves three problems at once: it replaces the tired dampers with fresh performance valving, it lets you lower the car 1–2 inches to close the wheel gap and drop the center of gravity, and — on the adjustable kits — it lets you tune how the car reacts to bumps and cornering loads. Because the B5 platform runs a wide front track and heavy iron-block V6 up front, damping quality matters even more here than on a lighter car; the front axle is doing most of the work of controlling that weight. All three kits below are direct-fit for the 8D chassis and share the same 2.7T front geometry, so the choice comes down to adjustability and budget rather than fitment.

Audi B5 S4 Coilovers Compared: ST vs KW V1 vs KW V3

Here is how the three B5 S4 coilover kits stack up on the specs that decide the buy. All three are height-adjustable and share the same threaded-body concept; the real separation is in damping adjustment and construction. Prices at NLP Performance currently run from around $1,089 for the ST X up to just under $2,900 for the fully adjustable KW V3.

KW Variant 3: The Best Overall B5 S4 Coilover

The KW Variant 3 is the best all-around coilover for the B5 S4 because it is the only kit here that separates compression and rebound damping, so you can soften the ride for daily driving and stiffen it for track days without compromise. Rebound (the low-speed extension phase) adjusts across 16 clicks at the top of the damper, while compression is set at the lower end of the shock through KW's patented multi-purpose valve. Both circuits ride on KW's stainless-steel "inox-line" body, which resists the road-salt corrosion that kills lesser threaded collars over a New England or Midwest winter — a real consideration on a car this age.

KW Variant 1: Premium Build, Fixed Damping

The KW Variant 1 is the smart pick if you want KW's stainless-steel quality and a proven lowered stance but do not care about adjusting damping. The V1 uses the same corrosion-resistant inox-line strut body as the V3 but ships with KW's fixed, factory-set valving — a damping curve KW tuned specifically for the 8D chassis to balance ride comfort against body control. You still get full threaded ride-height adjustment, so you can set your drop exactly where you want it in the fender. For a street-driven B5 S4 that will never see a track, the V1 delivers most of the KW driving experience at roughly $1,774, about a thousand dollars less than the V3.

ST X Coilovers: The Budget Entry Point

The ST X kit is the lowest-cost way to put quality height-adjustable coilovers under a B5 S4, at around $1,089. ST Suspensions is KW's in-house value brand, so the ST X is engineered on the same German test rigs but built to a lower price with a galvanized-steel body and fixed damping rather than KW's stainless inox construction. For a daily-driven or budget build, that is a sensible trade: you still get a properly matched spring-and-damper package and threaded ride-height adjustment, just without the winter-proof coating or the ability to fine-tune damping. Note the ST X is cataloged for the 2000–2001 S4 and 1996–2001 A4 quattro on the 8D chassis.

Is Adjustable Damping Worth It on a B5 S4?

Adjustable damping is worth it if you will actually use it — for a B5 S4 that alternates between commuting, spirited canyon runs and the occasional track or autocross day, the KW V3's separate compression and rebound circuits let one kit cover all three. Rebound controls how quickly the suspension extends after a compression, which affects grip and body control; softening it calms the ride, while firming it tightens turn-in and reduces float over crests. Compression controls how the damper reacts to bumps and weight transfer under braking. Being able to set them independently is genuinely useful on a nose-heavy 2.7T that piles weight onto the front axle under braking.

If your S4 is a weekend cruiser or a daily that you will set once and forget, fixed damping is not a downgrade — it is one less thing to get wrong. Both the KW V1 and the ST X arrive with valving already matched to the 8D chassis, so they ride well straight out of the box. In that case the money is better spent elsewhere on the car. The decision tree is simple: pick the V3 if you want to tune, the V1 if you want KW stainless quality at a lower price, and the ST X if getting a clean, quality lowered stance for the least money is the priority.

Don't Skip Caster and Alignment on a Lowered B5

Whenever you lower a B5 S4, budget for an alignment and consider a caster-correction bushing, because dropping the car changes suspension geometry and the factory rubber is likely cracked after 20-plus years. Whiteline's front caster-correction radius-arm bushing (part KCA422) restores and can increase front caster on the 8D chassis, sharpening steering feel and straight-line stability while replacing worn OE bushings that let the front axle wander. At around $71 it is a cheap, high-value addition to any B5 S4 coilover install, and it fits the wider B5/B6/C5 Audi family.

Installation, Ride Height and What Else to Budget For

Plan on a full day for a first-time coilover install on the B5 S4, or roughly 4–6 hours for an experienced shop. The quattro front end is tight, and you will be fighting 20-plus years of corrosion on the strut and subframe hardware, so penetrating oil and fresh top-mount and sway-bar end-link hardware are smart to have on hand. After the install, set your ride height, roll the car, let it settle, then take it straight for a corner-balance-friendly alignment — do not drive on a lowered car with the factory alignment specs. Our team in Tampa, FL sees the same three add-ons pay off on nearly every B5 S4 suspension job: fresh control-arm bushings, upgraded end links, and the caster bushing above.

If you are refreshing the whole car, a coilover kit also pairs naturally with a cat-back exhaust and a set of lightweight wheels to complete the stance and drop unsprung weight. You can browse the full range of coilovers, springs and sway bars for your Audi in our suspension collection, and our fitment team can confirm the right kit for your exact 2000–2002 S4 before you buy.