SPEC Single Mass Flywheel (SMF) DMF Delete Solid Flywheel Conversion for BMW 135i 335i 335d N54 N55 (E82/E90, 2007-2012) | Lightweight Rebuildable Billet Aluminium 14 lb or Steel 22 lb | Performance Flywheel for Non-SAC Clutch

Lightweight billet SMF conversion for BMW 1 Series E82 and 3 Series E90 3.0 models 2007-2012

Unlock sharper pedal response, faster rev-up and a more connected drivetrain feel with this SPEC billet solid flywheel. Designed for the twin-turbo straight six and 3.0 diesel variants, it replaces the heavy dual-mass unit with a serviceable, low-inertia assembly that works with a non self-adjusting clutch for greater clamping capability and high rpm control. A proven upgrade for fast road and track day builds.

Why enthusiasts choose this flywheel

• Reduced rotational mass for snappier acceleration and cleaner heel-and-toe downshifts
• Non-SAC pressure plate compatibility for higher clamp load and stronger holding power
• Billet, rebuildable core with low MOI characteristics for repeatable performance
• Two material options to suit your build: aluminium 14 lbs or steel 22 lbs
• Dyno-backed gains: aluminium option has delivered 17 whp on an otherwise stock car in our testing
• Steel option shows around 10 whp and tames gearbox resonance for a quieter idle with the pedal out

We run these units on our own cars and customer projects and the difference in drivability is immediate. If you want quicker throttle pick-up, crisper gear changes and a more engaging drive, this is the upgrade.

Material guidance

• Billet aluminium - 14 lbs. Maximum responsiveness and the strongest wheel horsepower improvement we have seen at 17 whp.
• Billet steel - 22 lbs. Excellent road manners, extra damping for a calmer idle with the pedal out, approximately 10 whp gain.

Important notes

• Works with a non-SAC mechanism pressure plate. This is required to achieve the increased clamp loads.
• Not compatible with the factory self-adjusting clutch design.
• You will also need the SPEC BMW clutch for 335i and 335d. Contact us for pairing advice.

Applications

• BMW 135i 3.0L N54 2007-2009
• BMW 135i 3.0L N54 or N55 2009-2012
• BMW 335i and 335d 3.0L 2007-2009
• BMW 335i and 335d 3.0L 2009-2012

Part numbers

• SB53S-2
• SB53A-2
• SB53S-3
• SB53A-3

Compatibility check before dispatch

We verify fitment prior to shipping. Add your UK registration or the last 7 characters of your VIN at checkout and we will confirm compatibility.

Professional fitting

We recommend professional installation. MJ Modifications in Warwickshire can fit this upgrade for you. Request a quote at info@mjmodifications.co.uk.

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