KW Street Comfort Coilover Suspension Kit for BMW 6 Series E63/E64 (2004-on) Coupe & Cabrio/Convertible | Height & Rebound Adjustable Dampers | Inox-Line Stainless Steel | Lowering Coilovers | Adjustable Shocks/Struts | Part 663C

KW Street Comfort Suspension Kit for BMW 6 Series E63 E64 2004 onwards - Part 663C

Looking for a smoother, calmer ride in your BMW 6 Series without losing precision and control? This KW Street Comfort adjustable suspension package is our go-to upgrade for E63 Coupe and E64 Cabriolet owners who want daily usability, a tasteful drop and confidence on UK roads. It delivers genuine ride quality with the ability to fine tune rebound and ride height to suit motorway miles, B-road blasts and everything in between.

What you will feel straight away

• Real-world comfort with an OE-plus character on British tarmac
• 16-stage rebound tuning so you can set it plusher for long trips or firmer for extra body control
• Ride height adjustment for a clean stance while keeping clearance for speed bumps
• Inox stainless damper bodies for corrosion resistance through wet winters and salted roads
• Easy-to-adjust trapezoidal threads and composite spring seats that won’t seize over time
• Development and sign-off by KW including 7-post rig testing

Fitment

BMW 6 Series E63 Coupe and E64 Cabriolet, 01/2004 onwards.

Lowering range

• Front: 10 to 30 mm
• Rear: 10 to 30 mm

Maximum permitted axle loads

• Front: up to 1100 kg
• Rear: up to 1270 kg

Why this comfort-focused upgrade works

If your factory dampers feel crashy or your current aftermarket setup is too harsh, this comfort-tuned kit brings compliance back while keeping the 6 Series planted and composed. Shorter housings paired with carefully matched spring and damper rates reduce float and sharpening turn-in, while rebound adjustment lets you dial in the exact balance you want for your wheels and tyres.

Durability for year-round driving

The inox stainless construction fights rust for long-term reliability. With dirt-resistant threads and a robust composite collar, height changes remain straightforward even after many winters.

Proven by us and our customers

We have installed this kit on multiple E63 and E64 builds. Feedback is consistent every time: quieter ride, more settled at motorway speeds, better compliance over rough surfaces and a confident, controlled feel on fast road drives. Owners love the improvement in comfort without sacrificing handling.

Installation and setup

Professional fitting and four-wheel alignment recommended. For installation and a tailored setup, book with MJ Modifications in Warwickshire. Request a fitting quote: info@mjmodifications.co.uk.

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Part number

663C

Please check your vehicle’s axle loads and compatibility before ordering.