YCW Reference Series Coilover Kit for BMW E46 325i/330i (Non-M3) - 4K/12K Swift Springs, 7-Way Adjustable, Fast Road & Track, Rebuildable

Reference Series Height Adjustable Suspension for BMW 3 Series E46 325i 330i - 4K front 12K rear Swift springs - 7-click damping - Serviceable

Unlock sharp steering, real confidence and fast-road composure for your six-cylinder E46. This Reference Series height adjustable damper and spring package delivers the road feel and control keen drivers want for spirited street use and regular trackdays, with the comfort to enjoy daily driving. If you are hunting for an E46 325i or 330i suspension upgrade that blends balance, grip and reliability, this kit is the proven choice.

We run these units on our own builds and customer cars and the feedback has been consistently excellent for ride quality, stability and pace on UK B-roads. You get quality materials, smart valving and proper aftercare at a price that embarrasses many so-called premium options.

Why this setup works on the E46 straight-six

• Road and circuit ready - composed on rough tarmac, controlled on smooth circuits
• 4K front and 12K rear Swift linear springs - predictable support with genuine ride control
• 7-position rebound adjustment - easy clicks to tailor comfort or support for road, wet or dry
• Ride height adjustability - set stance and corner weights correctly
• Camber and caster adjustable top plates - dial in front-end bite and tyre wear
• Fully rebuildable dampers - long-term value with serviceable components
• Built to resist UK weather - corrosion protection that stands up to winter salt

Engineering details that matter

• Forged 6061-T6 hard anodised aluminium front upper mounts
• High-tensile carbon steel camber and caster plates with anti-slip finish
• Oversized PTFE-lined Japanese spherical bearing upper mounts for precise steering feedback
• Forged 6061-T6 hard anodised aluminium spring seats with sealed Japanese radial bearing
• 65 mm ID cold-wound Japanese HS5.TW steel linear springs by Swift
• Chassis-matched rates for the E46 platform
• 52 mm OD cold-drawn Japanese SAE 1020 seamless carbon steel damper bodies
• Black-zinc plated fully threaded bodies - 250-hour salt-spray tested
• Forged SAE 4140 chromoly piston rod with ceramic rod guide
• 7-step rebound control for quick repeatable setup
• 44 mm OD forged 7075-T6 hard anodised aluminium Double-Digressive-Blow-Off piston
• Silkolene PRO RSF VI-460 damper oil with Viton performance O-rings
• Forged 6061-T6 hard anodised lower lock collars and mounts or high-tensile carbon steel where applicable
• Silicone end caps on lower mounts where applicable
• Weather-resistant neoprene shock covers
• Rebuildable construction for service and longevity

On-road and track benefits

• Faster turn-in and stronger front grip - confidence under braking and turn-in
• Stable mid-corner balance and traction off the apex
• Less roll and pitch without the crashiness of cheap kits
• Consistent performance in all seasons thanks to robust finishes and quality seals
• Simple tuning - match damping to tyres, alignment and driving style in seconds

Fitment

Designed for BMW 3 Series E46 non-M3 models including 325i and 330i.

Part number

YCW-REF-E46

Manufacturer

YCW Engineering

Warranty

Lifetime warranty on all hard parts and 1 year warranty on wear parts.

Compatibility check before dispatch

We verify compatibility before shipping. At checkout, add your UK registration number or the last 7 digits of your VIN so we can confirm suitability for your vehicle.

Professional installation and alignment

For expert fitting, corner-weighting and geometry setup, book with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a tailored quote and recommended baseline settings for your 325i or 330i.

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