ACT 2015 Mitsubishi Lancer XACT Flywheel Prolite
The ACT 600555 is a 10.1 lb chromoly Prolite flywheel for the 2008-2015 Mitsubishi Lancer Evolution X with the 2.0L turbo engine and five-speed manual. Our listing calls it a 2015 Lancer, but it is an Evo X part. Buyers usually need it when the factory flywheel is heat-checked or worn during a clutch job, or when a track, rally or autocross car needs the engine to rev up and fall faster between shifts. It is ACT's lightest flywheel for the car, and ACT recommends it for race use.
The flywheel bolts to the crank, carries the 114-tooth ring gear the starter turns, and gives the clutch disc a flat friction surface. It also stores rotating energy. Cutting that mass lets the turbo engine gain and lose RPM faster, so upshifts recover boost quicker and heel-toe downshifts match sooner. ACT forges the 600555 from chromoly in one piece, CNC machines it, computer balances it and induction-hardens the ring gear. There is no insert to warp and no separate ring gear to loosen. It is SFI 1.1 certified and can be resurfaced like a stock part.
The trade is drivability. ACT lists the feel as mild to moderate gear rattle and says Prolite flywheels have reduced drivability. If the car is mostly a street car, ACT's 600550 Streetlite flywheel for the same Evo X is the calmer choice. Our lightweight vs stock flywheel guide explains the difference.
On an Evo X the transmission and transfer case come out to reach the flywheel, so the decision is normally made with it in view. Check for heat cracks toward the bolt holes, measure runout with a dial indicator and look over the ring gear. Shallow glazing can often be machined out; cracks and deep hot spots mean replace it. Our resurface vs replace guide covers that call. If you are still deciding whether the slip is the clutch, start with the slipping diagnosis guide, and our Lancer transmission problems guide covers other gearbox faults that show up on these cars.
ACT lists 600555 for the 2008 Evolution GSR, 2009 Evolution GSR and RS, 2010-2013 Evolution GSR, 2014 Evolution and Evolution GSR, and 2015 Evolution GSR and Final Edition, all with the 2.0L DOHC turbo engine. It is not listed for the Evo X MR, which uses the twin-clutch automated gearbox, or for the regular Lancer and Lancer Ralliart. ACT specifies a 240 mm (9.4 inch) friction surface and 114 teeth, and notes that the step, thickness and ring gear offset must suit your clutch. Pair it with a 240 mm single-disc Evo X kit. If the car has a non-factory transmission or you are unsure of the trim, send us the year and VIN. More clutch parts are in our hard parts collection.
The 600555 is new, in stock, ships from the USA the same business day and carries a 1-year warranty.
| Brand | ACT |
| Part number | 600555 |
| Fits | ACT 2015 Mitsubishi Lancer XACT Flywheel Prolite |
| Vehicle fitment | Mitsubishi Lancer Xact (2015) |
| Type | Flywheels |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
No. ACT lists it only for the 2008-2015 Lancer Evolution X with the 2.0L turbo engine (GSR, RS, 2014 Evolution and 2015 Final Edition). It does not fit the base Lancer or Ralliart.
ACT does not list it for the MR. The MR uses the twin-clutch automated gearbox, while this flywheel is for the manual cars.
ACT lists 10.1 lb. It is ACT's race-focused Prolite with mild to moderate gear rattle and reduced drivability. For a daily driver, the 600550 Streetlite is the better pick.
ACT says its flywheels work with good-quality clutches when the step, tooth count, thickness and offset match. Use a 240 mm single-disc Evo X kit such as ACT ME3-HDSS.
Yes. Resurface it like a stock flywheel, removing no more than 0.040 in and keeping the correct step.
