BMW 335i & 340i (F30) Coilovers: KW vs ST Compared

Fitting coilovers is the single biggest handling upgrade you can make to a 2012–2018 BMW 335i or 340i. The F30 is a genuinely quick sports sedan — the N55-powered 335i makes 300 hp and 300 lb-ft, and the B58-powered 340i steps up to 320 hp and 330 lb-ft — but BMW tuned the factory dampers for comfort, leaving body roll, a tall fender gap, and a floaty highway feel. The right set of BMW 335i and 340i (F30) coilovers fixes all three at once: it drops the car, sharpens turn-in, and lets you tune damping to match street, canyon, or track. Below we put five in-stock kits head to head — the electronically adjustable KW DDC, the KW V3, V2 and V1, and the value-leading ST XA — so you can match the right coilover to your F30, your drivetrain, and your budget.

Why the F30 335i and 340i Respond So Well to Coilovers

The F30 335i and 340i respond dramatically to coilovers because BMW's factory suspension prioritizes ride comfort and a tall ride height over body control. At roughly 3,600 lb with a near 50/50 weight balance and a turbocharged inline-six over the front axle, the chassis has the bones of a corner-carver, but the soft OEM springs and non-rebuildable twin-tube dampers let it lean, dive, and squat far more than the grip actually requires. Run-flat tires only add to the harsh-yet-floaty compromise.

A quality coilover attacks the problem from both ends. Shorter, stiffer springs cut the center of gravity and close up the wheel gap by roughly 0.6 to 1.6 inches, while a monotube or high-pressure twin-tube damper controls the extra spring rate so the car settles instead of bouncing. On the 335i and 340i specifically, the payoff is faster, flatter turn-in, more predictable mid-corner behavior, and a planted highway feel — without the crashiness that cheap lowering springs on worn-out struts deliver. Because every kit here is height-adjustable, you also set corner-by-corner ride height to level the car and dial in tire fitment.

BMW 335i & 340i (F30) Coilover Comparison at a Glance

All five kits below are confirmed to fit the 2012–2018 F30 335i and 340i. The key differences are how much damping control you get, whether the kit talks to factory EDC (Electronic Damping Control), the body material, and price. Use this table to shortlist, then read the individual breakdowns underneath.

KW DDC Plug & Play: Best Overall for EDC-Equipped F30s

The KW DDC Plug & Play is the best F30 coilover for any 335i or 340i that left the factory with Electronic Damping Control (adaptive M Sport or Dynamic Handling suspension). It plugs straight into the OEM electronic damper harness, so you keep the factory Comfort, Sport, and Sport+ modes and the button on the console — but now on a stainless, height-adjustable coilover you can lower 0.6 to 1.4 inches. In other words, you get a proper drop and corner-balancing capability without giving up the everyday-comfort trick that made you buy an adaptive car in the first place.

KW Variant 3 (V3): Best for Track-Day Adjustability

The KW V3 is the enthusiast's choice for a non-EDC 335i or 340i because it separates the two damping jobs a coilover has to do. You adjust rebound (how fast the wheel returns after compression) independently from low-speed compression, which means you can firm up body control for a track day and soften the reaction over expansion joints on the drive home — all without changing ride height. On the F30 it lowers roughly 0.8 to 1.6 inches, rides on the same stainless inox-line body as the DDC, and is the kit our shop reaches for when a customer wants one set of coilovers to do daily, canyon, and occasional track duty.

KW Variant 2 (V2): Best Balance of Comfort and Control

The KW V2 is the sweet spot for most street-driven F30s. It adds single-adjustable rebound damping — a 16-click dial that lets you soften the ride for commuting or firm it up for spirited driving — on top of the same height adjustment and stainless body as the pricier kits. You give up independent compression control versus the V3, but for a 335i or 340i that mostly sees streets and the occasional back road, the V2 delivers 90 percent of the experience for meaningfully less money. It lowers about 0.6 to 1.5 inches and, like every kit here, ships free.

KW Variant 1 (V1): Best Entry Point into KW Quality

The KW V1 is the most affordable way into a genuine KW coilover for the F30. It skips damper adjustability — the valving is factory-set to a comfort-biased tune KW developed specifically for the chassis — but keeps the stainless inox-line body and full height adjustability. For a 335i or 340i owner who wants a clean, engineered drop of roughly 0.6 to 1.2 inches with a warranty and a set-it-and-forget-it ride, the V1 is a smart, no-fuss buy at $2,094. The kit shown fits the 3.0L rear-wheel-drive F30.

ST XA: Best Value Coilover for the F30

The ST XA is the value pick, and it is no accident that it feels like a KW: ST Suspensions is KW's in-house value brand, built on the same engineering with a galvanized-steel body instead of stainless. The XA gives you both height adjustment and rebound-damping adjustment — a rare combination near the $1,400 mark — plus a wide drop range of roughly 0.8 to 2.0 inches for owners who want an aggressive stance. This part number fits rear-wheel-drive F30 (as well as F22 and F32 RWD) cars without EDC. For a first coilover on a street-driven 335i or 340i, the value here is hard to beat.

How to Choose the Right F30 Coilover: EDC, xDrive & Drop

Choosing the right F30 coilover starts with one question: does your car have EDC (adaptive dampers)? If yes, the KW DDC Plug & Play is the only kit here that preserves that system — the KW V1/V2/V3 and ST XA part numbers shown are for non-EDC cars. If you are unsure, look for a suspension button on the console or check for the adaptive M Sport or Dynamic Handling package on your build sheet.

Next, confirm your drivetrain. The F30 came in rear-wheel drive and xDrive all-wheel drive, and coilovers are drivetrain-specific because the front strut and spindle differ. The V1 and ST XA shown here are RWD kits; KW and ST both offer dedicated xDrive versions of the V1, V2, V3, and DDC, and we can match the exact part number to your VIN. Finally, set your goal: a mild, comfortable 0.6 to 1.0 inch drop for a factory-plus look, or a more aggressive 1.5 inch-plus stance. Every kit here is height-adjustable, so you are choosing a range, not a fixed drop.

Installation, Alignment & Corner Balancing

Plan on a professional coilover installation taking about 4 to 6 hours on an F30. The job includes removing the front struts and rear spring/damper units, setting a baseline ride height, and — critically — a four-wheel alignment afterward, because lowering the car changes camber and toe. At our Tampa, FL shop we also recommend a corner-balance (weight-scaling the car) on the V2, V3, and DDC kits to get the most from their adjustability, and we check for adjustable front control arms or camber plates if you plan an aggressive drop that pushes negative camber past factory tolerances.

A few F30-specific notes: budget for new rear shock mounts if yours are worn, verify front sway-bar end-link clearance at your final ride height, and re-torque and re-check ride height after the first 100 to 200 miles once the springs have settled. Do those things and any of these five kits will transform how your 335i or 340i drives.