Clutch Masters 21-23 BMW M3/M4 3.0L S58 Factory Fit FX400 6-Puck Twin Disc Clutch w/Alum....

Drag launches, clutch kicks and repeated track sessions are where a 2021 to 2023 BMW M3 or M4 six-speed clutch gives up first. The Clutch Masters Factory Fit FX400 6-puck, part number 03240-HDC6-DLX, is the most aggressive disc in the Factory Fit line: a ceramic puck twin disc with an aluminum flywheel, aimed at tuned S58 cars that see the strip or the road course as often as the street. It grabs hard and holds, and it trades some low-speed refinement to do it.

How the 6-puck twin disc behaves in an S58 manual

Like the factory part, this is a twin disc: two discs and a floater plate share the clamp load from one cover. Clutch Masters reworked the package for more capacity. The factory self-adjusting cover is replaced with a stamped steel cover, disc diameter goes from 8.5 to 9.5 inches, and a Type 3 hard anodized aluminum flywheel and steel floater complete the set. Clutch Masters says the whole assembly sheds a little over 10 lb compared with stock, which also lets the engine rev up and drop between shifts more quickly.

The disc itself is a ceramic paddle design on a sprung hub. Unlike the 8-puck version, the 6-puck uses solid rivets with no marcel cushion between the linings. Clutch Masters is direct about what that means: the 6-puck engages very quickly and may chatter slightly in first and reverse, which is why the company uses premium ceramic material to keep that in check. In return you get high holding capacity and fast heat recovery when the car is launched repeatedly. In its Turn 14 product data Clutch Masters also mentions the 2023 G87 M2 with the S58 and six-speed for this 6-puck kit; our listing is for the M3 and M4, so M2 owners should ask us to confirm before ordering.

Symptoms this kit is built to cure

• Slip on a hard launch or a clutch kick, even with a recent clutch
• Tach flare at the top of second or third on the strip
• Fade after a few laps, with the bite point moving and a hot friction smell
• A worn or heat-cracked factory flywheel face from repeated hard starts
• A softer street clutch that could not handle the power after a turbo or fuel upgrade

How to confirm before you buy

Log a pull in a high gear from low rpm. Engine speed rising faster than vehicle speed is slip. Check the hydraulic side before spending money on parts: look for fluid at the slave or bellhousing, a pedal that feels soft, or one that does not return fully, because any of those can leave the clutch partly disengaged. Check for engine oil or gear oil on the bellhousing too, since contamination ruins any new disc. Our manual versus automatic repair cost guide helps you budget the transmission-out labor.

Is the 6-puck the right choice?

Be honest about how the car is used. If it is mostly a street car, the FX400 8-puck gives ceramic holding power with much less chatter, and the Factory Fit FX350 sits between that and the organic FX250. For the very highest power levels, look at the strap-driven FX1000 race twin disc.

Fitment

This listing covers the 2021, 2022 and 2023 BMW M3 and M4 with the S58 3.0L twin-turbo inline-six and the six-speed manual. It will not work with the automatic. North American Competition and xDrive models were not sold with a manual, so this fits the standard manual cars. Send us the year and the last 7 of your VIN if you want the fit checked, especially on a converted car or an M2. Other clutch and flywheel parts are in our rebuild kits department.

Install notes

• Plan for a transmission-out job, and replace the rear main seal or input seal now if there is any sign of a leak.
• Fit the included aluminum flywheel with new crank bolts torqued to BMW's specification. The disc set is matched to this flywheel and floater.
• Assemble disc, floater, disc and cover in the order shown in the instructions, center both discs with an alignment tool, and snug the cover bolts down evenly in a crisscross sequence.
• Bleed the clutch hydraulics with the BMW-specified brake fluid and make sure the pedal is firm and returns fully.
• Do not launch it right away. Clutch Masters requires a minimum of 500 miles of normal driving with no full-throttle shifts or compression braking.

Will the 6-puck chatter?

It can. Clutch Masters warns that because the 6-puck disc has solid rivets and no marcel cushion, it engages very quickly and may chatter slightly in first and reverse.

Should I get the 6-puck or the 8-puck for a street car?

For a car that is driven mostly on the street, the 8-puck is the better pick. Clutch Masters designed the 8-puck for street-driven vehicles and describes the 6-puck as possibly not ideal for the street.

Does it fit the M2?

Clutch Masters mentions the 2023 G87 M2 with the S58 and six-speed for this kit, but our listing is for the 2021-2023 M3 and M4. Send us the year and VIN and we will confirm before ordering.

What is included?

The Factory Fit kit is a complete replacement with a Type 3 hard anodized aluminum flywheel, a steel floater, a stamped steel cover and two clutch discs.

How long is break-in?

Clutch Masters calls for at least 500 miles of normal stop-and-go driving, with no full-throttle shifting or compression braking, before hard launches.

• Automatic vs Manual Transmission Repair Cost