ACT 01-06 BMW M3 E46 XACT Flywheel Streetlite
The ACT 601010 XACT Streetlite is a single-mass chromoly flywheel for the 2001 to 2006 BMW M3 (E46) with the S54 3.2L straight-six and six-speed manual. Most buyers land here because the factory dual-mass flywheel has started to clatter at idle, clunk on and off the throttle, or shudder on takeoff, and they want a replacement that will not wear out the same way. Others are doing a clutch upgrade and want the S54 to pick up revs faster without giving up street manners.
The stock M3 flywheel is two masses joined by springs that absorb firing pulses before they reach the gearbox. When those springs and bushings wear, the two halves knock against each other. The 601010 replaces that assembly with one forged, CNC machined and computer balanced piece, so there is nothing inside it left to wear.
ACT lists the 601010 at 15.1 lb with a 240 mm (9.4 in) friction surface, a 113-tooth induction-hardened ring gear and an SFI 1.1 rating. ACT describes the Streetlite line as considerably lighter than stock, its most durable flywheel, and recommended for street and race use. Because it is still heavier than the 9.9 lb 601015 Prolite, it keeps enough inertia to pull away from a light without excess slipping, which is why it is the usual pick for a car that still sees commuting. ACT's own description of the feel is OE to mild gear rattle, and its fitment note says gear rattle is expected with any single-mass conversion.
Listen at the bellhousing at idle while a helper presses and releases the pedal. A noise that changes with the pedal points to the flywheel or release bearing rather than the valvetrain or gearbox internals. With the transmission removed, try to rotate the two masses against each other; a worn unit will move and knock well beyond its normal spring travel. If the real complaint is the clutch letting go under load, start with our slipping diagnosis guide, because a worn disc does not by itself mean the flywheel must be replaced.
ACT's application chart lists the 601010 for the 2001 to 2006 BMW M3 with the S54, including Euro-market E46 M3 cars. It does not fit the E46 325i, 328i or 330i, which use different engines and clutch packages; the 330i has its own ACT Streetlite under a different part number. ACT states the 601010 works with both the factory clutch kit and ACT clutch kits. If your car has had an engine or transmission swap, send us the year and VIN before ordering. More options are in our hard parts collection.
Because a solid flywheel passes more of the S54's firing pulses into the gearbox, some idle gear rattle is normal after the swap and is not a sign of a defect.
| Brand | ACT |
| Part number | 601010 |
| Fits | ACT 01-06 BMW M3 E46 XACT Flywheel Streetlite |
| Vehicle fitment | BMW M3 E46 Xact (2001-2006) |
| Type | Flywheels |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
ACT lists it at 15.1 lb. The 601015 Prolite for the same car is 9.9 lb and is aimed at race use.
Yes. ACT says the 601010 can be used with the factory clutch kit or ACT clutch kits. Most owners replace the clutch at the same time since the gearbox is already out.
Some gear rattle at idle is expected with any single-mass conversion. ACT rates the Streetlite feel as OE to mild rattle, less than the lighter Prolite.
No. It is listed for the 2001-2006 M3 with the S54 only. Non-M E46 models use different flywheels.
Yes. ACT includes M12-1.5 x 30 mm flywheel bolts.
Yes. ACT XACT flywheels resurface like a stock flywheel. Remove no more than 0.040 in and keep the correct step.
