XClutch 13-21 Subaru WRX STi Type RA 2.5L Lightweight Chromoly Flywheel
XClutch XFSU003CL is the lightweight version of the XClutch single-mass chromoly flywheel for the Subaru WRX STI with the 2.5L EJ257 turbo engine and six-speed manual. Our listing covers the 2013 to 2021 STI, including the Type RA trim. Buyers usually come here during a clutch upgrade on a tuned car: the factory flywheel has hot spots or cracks from a slipping clutch, or the owner wants the engine to rev and fall faster between shifts on track.
The flywheel bolts to the EJ257 crankshaft and does three jobs: it is the rear friction face the clutch disc clamps against, it carries the starter ring gear, and its mass smooths out idle and low-speed engagement. XClutch machines the XFSU003CL from 4140 chromoly steel, a single solid piece with no springs or inner mass to wear. In the XClutch product data the CL part is the lightweight design, marked for track use and for single-disc clutches. Its sibling, the standard XFSU003C chromoly flywheel, keeps more mass and is the one XClutch marks for street use.
That is the real choice on this page. Less rotating mass lets the engine pick up and drop rpm faster, which helps rev-matched downshifts and short-shifting on a road course. The trade is more gear rattle at idle, a touchier launch, and more chance of bogging if you are lazy with the throttle in traffic. On a car that is driven daily, the standard XFSU003C is usually the better buy.
Flywheel faults show up as clutch faults, so start by confirming what the clutch is doing. Rpm rising in fourth or fifth under boost without road speed following is slip; our slipping diagnosis guide explains the road test and how to rule out other causes, and clutch engages high or low covers pedal height complaints. With the gearbox out, check the old flywheel for cracks, measure runout with a dial indicator and inspect every ring gear tooth. Light glazing can be machined off; cracks, deep hard spots or a face already cut to the limit mean a new flywheel.
Our listing is for the 2013 to 2021 Subaru WRX STI 2.5L turbo with the six-speed manual, and the XClutch catalog data we stock from lists the same 2013-2021 STI range. It is not for the five-speed WRX, the 2015 and later FA20 WRX, or any automatic car. Earlier 2004 to 2012 STI cars are covered by the standard XFSU003C, so if you are not sure of the year, or the car has a swapped engine or gearbox, send us the year and VIN before ordering. More STI flywheels and clutch parts are in our hard parts collection.
This XFSU003CL flywheel is new, in stock, ships the same business day from the USA and carries a 1-year warranty.
| Brand | XCLUTCH |
| Part number | XFSU003CL |
| Fits | XClutch 13-21 Subaru WRX STi Type RA 2.5L Lightweight Chromoly Flywheel |
| Vehicle fitment | Subaru Wrx Sti Type Ra (2013-2021) |
| Type | Flywheels |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Both are XClutch 4140 chromoly single-mass flywheels for the STI. The CL is the lightweight version that XClutch marks for track use; the C keeps more mass and is marked for street use.
Our listing and the XClutch data we stock from cover 2013-2021 only. For 2004-2012 STI cars use the standard XFSU003C, or send us the VIN and we will check.
Usually yes. Removing rotating mass makes idle gear rattle more noticeable and launches touchier. That is normal for a lightweight single-mass flywheel, not a defect.
No. XClutch marks this flywheel for single-disc applications. Twin-disc STI kits come with their own flywheel.
The flywheel itself needs none. Bleed the clutch hydraulics after the job, check the six-speed gear oil and follow the 1,000 km XClutch break-in.
