Clutch Masters 21-23 BMW M3/M4 3.0L S58 Factory Fit FX250 Twin Disc Clutch w/Alum. Flywheel

The factory twin disc in a 2021 to 2023 BMW M3 or M4 with the six-speed manual is a smooth, quiet unit, but it was sized for stock power. Owners who add a tune, a downpipe or simply a lot of hard launches start to see the tach jump in the upper gears, and a worn factory clutch is an expensive OE replacement. The Clutch Masters Factory Fit FX250, part number 03240-HD0F-DLX, is the most street-friendly kit in the Factory Fit line. It keeps the light pedal and easy take-off of the original clutch while adding holding capacity, so the car still drives like a daily driver.

What the FX250 twin disc does in an S58 M3 or M4

A twin disc clutch clamps two friction discs with a floating plate between them, so it gets twice the friction surface without growing in diameter. Clutch Masters built the Factory Fit kit around the layout BMW used, then changed the parts that limit it. The factory self-adjusting cover is gone, replaced by a stamped steel cover, and the discs grow from 8.5 inches to 9.5 inches for much more surface area. The kit comes with a Type 3 hard anodized aluminum flywheel and a steel floater, and Clutch Masters says the full assembly is a little over 10 lb lighter than stock.

The FX250 friction is a hybrid. On the Clutch Masters FX250 single disc, the face against the pressure plate is Fiber Tough material and the flywheel side is steel backed organic, and the company says its twin disc kits use those same proven FX compounds. Organic on one side keeps engagement soft and predictable in traffic, and Fiber Tough on the other adds bite and heat tolerance. For a car that is driven every day and tuned moderately, that is the right balance.

Symptoms that mean the factory clutch is done

• RPM flare in third through sixth at full throttle, with no added pull
• A higher engagement point than when the car was new
• Burnt friction smell after a hill start, a launch or stop-and-go traffic
• Judder pulling away from a stop, often from a glazed disc or hot-spotted flywheel
• Slip that started right after a tune raised boost and torque

How to confirm before you buy

Do a simple slip test. In fourth or fifth gear at low rpm, go to full throttle. If engine speed climbs faster than road speed, the clutch is slipping. Then rule out the hydraulics: a fluid leak at the bellhousing, a soft pedal, or a pedal that does not come all the way back can keep the clutch partly released and mimic a worn disc. Look for oil, too. A leaking rear main seal will contaminate any new clutch. If you are weighing the cost of the job, our manual versus automatic repair cost guide covers what labor usually runs.

Which Factory Fit stage to choose

The FX250 is for a stock or mildly tuned car where comfort comes first. If the car makes more power or sees track days, step up to the Factory Fit FX350 or the FX400 8-puck. Big-power race builds belong on the FX1000 race twin disc.

Fitment

This kit is listed for the 2021, 2022 and 2023 BMW M3 and M4 with the S58 3.0L twin-turbo engine and the six-speed manual. It does not fit automatic cars. In North America the manual was sold only on the standard M3 and M4, not the Competition or xDrive models. If your car has been converted or you are unsure of its build, send us the year and last 7 of the VIN before ordering and we will check it. More clutch and flywheel parts are in our rebuild kits department.

Install notes

• This is a transmission-out job. Replace the rear main seal or the input seal now if either shows any seepage.
• Bolt the supplied aluminum flywheel to the crank with new bolts torqued to BMW's specification. The discs, floater and cover are matched to that flywheel.
• Stack the discs and floater in the order the instructions show and center them with an alignment tool, then draw the cover down evenly in a crisscross pattern.
• Bleed the clutch hydraulics with the brake fluid BMW specifies and confirm a firm pedal before the first drive.
• Follow the Clutch Masters break-in: at least 500 miles of normal stop-and-go driving with no full-throttle shifts or compression braking.

Will the FX250 feel like the stock BMW clutch?

It is the most street-friendly Factory Fit stage. The organic face on the flywheel side keeps take-off smooth, so most owners find it close to stock in traffic, with more holding power once the car is tuned.

What comes in the kit?

Clutch Masters lists the Factory Fit kit as a complete replacement: a Type 3 hard anodized aluminum flywheel, a steel floater plate, a stamped steel cover and two clutch discs.

Does it fit the M3 or M4 Competition?

Only cars with the six-speed manual. In North America the Competition and xDrive models came with the automatic, so this kit is for the standard manual M3 and M4.

Is the FX250 enough for a tuned car?

It suits stock and mildly tuned cars driven mostly on the street. If the car runs a big tune, upgraded turbos or regular track days, the FX350 or FX400 is the better match.

Is there a break-in period?

Yes. Clutch Masters calls for a minimum of 500 miles of normal stop-and-go driving, with no full-throttle shifting or compression braking, before the clutch sees hard use.

• Automatic vs Manual Transmission Repair Cost