ACT 2007 BMW 335i XACT Flywheel Streetlite
The ACT 601180 XACT Streetlite is a one-piece chromoly flywheel for the early twin-turbo N54 BMW with a six-speed manual, starting with the 2007 335i. Owners buy it when the factory flywheel is rattling, slipping off its springs or overheated, or when they are upgrading the clutch for a tuned car and want a flywheel that can be resurfaced at every clutch job instead of replaced.
The flywheel bolts to the crankshaft, carries the starter ring gear and provides the friction face the clutch disc clamps against. Factory N54 manual cars use a dual-mass flywheel, which hides vibration with internal springs but wears out and cannot be machined. The 601180 replaces it with a single forged, CNC-machined piece. ACT lists it at 17.9 lb with a 240 mm (9.4 in) friction face and a 115-tooth induction-hardened ring gear, and describes it as considerably lighter than stock and the most durable flywheel style it makes. Less rotating mass lets the engine rev and settle faster between shifts.
The trade-off is noise. Without the dual-mass springs, more firing pulses reach the gearbox, so ACT recommends running this flywheel with one of its sprung-center discs (SS street or G6 six-pad) to keep gear rattle at OE-to-mild levels. Flywheel bolts are included (M12-1.5 x 25 mm).
Rattle with the pedal up that goes quiet with the pedal down points to the flywheel or input shaft area, not the engine top end. If the car also slips under boost, the clutch is due at the same time and both should be done in one transmission removal. Rule out oil from the rear main seal soaking the disc, a common reason a clutch slips early. Our slipping diagnosis guide covers how to tell clutch slip from other drivability problems, and the manual transmission repair cost guide helps you budget the labor.
Our listing is titled for the 2007 BMW 335i. ACT's application chart for 601180 covers N54 manual cars from 2007 to 2009: the 335i and 335xi or 335i xDrive, the 135i for 2008 and 2009, and the 535i and 535xi or 535i xDrive for 2008 and 2009. BMW changed clutch and flywheel parts on several N54 cars around early 2009, and ACT lists the 601030 XACT flywheel for later builds, so a 2009 car needs its production date checked. Send us your year and VIN and we will confirm the correct flywheel before it ships. Browse more parts in our hard parts category.
| Brand | ACT |
| Part number | 601180 |
| Fits | ACT 2007 BMW 335i XACT Flywheel Streetlite |
| Vehicle fitment | BMW 335I Xact (2007) |
| Type | Flywheels |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
ACT lists it for 2009 N54 cars, but BMW changed parts during early 2009 and ACT offers the 601030 flywheel for later builds. Send us your VIN or production date and we will tell you which one fits.
ACT designs its flywheels to work with good-quality clutches that match the application's step, thickness and ring gear specs, and recommends a sprung-center disc for noise control. Most buyers install a new clutch at the same time since the transmission is already out.
Some extra gear rattle at idle is normal when replacing a dual-mass unit with a solid flywheel. ACT rates the 601180 at OE to mild gear rattle when used with its SS or G6 sprung discs.
ACT lists the 601180 at 17.9 lb. It is chromoly steel with a 240 mm friction face and a 115-tooth ring gear.
Yes. ACT says XACT flywheels resurface like stock single-mass flywheels. Remove only enough to clean up the face, no more than 0.040 in, and keep the correct step.
