Exedy 2005-2005 Saab 9-2X Aero H4 Lightweight Flywheel
The Exedy FF01 is a one-piece chromoly steel lightweight flywheel for the 2005 Saab 9-2X Aero, the first-year Aero that used Subaru's 2.0L turbocharged flat-four and five-speed manual. Because the 9-2X was built by Subaru on the Impreza, this car shares its clutch and flywheel layout with the 2002-2005 WRX. Owners usually land here during a clutch job, when the factory flywheel shows hot spots or cracks, or when they want the turbo engine to rev more freely between shifts.
The flywheel is bolted to the crankshaft and gives the clutch disc its rear friction surface, carries the starter ring gear and stores rotating energy that keeps idle and low-speed takeoff smooth. Exedy machines the FF01 from chromoly steel with the ring gear teeth cut into the flywheel itself, so there is no pressed-on ring to loosen the way it can on some aluminum designs. Exedy says its steel lightweight flywheels are SFI certified and are aimed at lightly to moderately tuned cars that see street driving, autocross, rally or drag use.
Less rotating mass lets the 2.0L turbo engine pick up and drop rpm faster, which makes rev-matched downshifts quicker and helps the engine stay in boost between gears. The trade-off is that the car needs a little more throttle to pull away cleanly, and some extra gear rattle at idle is normal with any lighter flywheel. For a daily-driven Aero with a mild tune, most owners consider that a reasonable trade. The 2006 Aero switched to the 2.5L engine and uses a different part, the Exedy FF502A.
Flywheel problems almost always show up first as a clutch complaint, so start with the clutch and hydraulics. Our slipping diagnosis guide covers the high-gear road test, and the clutch chatter guide helps with takeoff judder. With the gearbox removed, look at the friction face under a strong light, check runout with a dial indicator and inspect each ring gear tooth. Light glazing can often be cleaned up by a machine shop; cracks, deep heat spots or damaged teeth mean replacement. If you are on the fence about a lighter flywheel for a mostly commuter car, our lightweight vs stock flywheel guide lays out the trade-offs.
This listing is for the 2005 Saab 9-2X Aero with the 2.0L turbo and five-speed manual. Exedy's distribution data matches the FF01 to the five-speed Subarus that share that clutch package, including the 2002-2005 Impreza WRX and several 2004-2005 Forester and Baja models. It is not the part for the 2006 9-2X Aero, the 9-2X Linear or 2.5i, automatic cars, or the six-speed STI. Engine and gearbox swaps are common on these cars, so if yours has been changed, send us the year, VIN and what is installed and we will confirm before it ships. More drivetrain parts are in our hard parts collection.
| Brand | Exedy |
| Part number | FF01 |
| Fits | Exedy 2005-2005 Saab 9-2X Aero H4 Lightweight Flywheel |
| Vehicle fitment | Saab 9-2X Aero H4 Lightweight (2005) |
| Type | Flywheels |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
No. The 2006 Aero uses the 2.5L turbo engine and takes the Exedy FF502A. The FF01 is the 2005 Aero part, matched to the 2.0L turbo five-speed.
Slightly. With less mass the engine loses rpm faster when you release the clutch, so pulling away needs a touch more throttle. Most drivers adjust within a few days, and some extra idle gear rattle is normal.
It is chromoly steel, with the starter ring gear teeth machined into the flywheel instead of a separate pressed-on ring. Exedy lists its steel lightweight flywheels as SFI certified.
It is not recommended. The disc has bedded into the old flywheel surface and the pressure plate and release bearing have the same mileage. Fit a new clutch kit and pilot bearing during the same job.
No. The STI uses a six-speed with a different clutch package and flywheel. The FF01 is for the five-speed 2.0L turbo cars such as the 2005 9-2X Aero and the 2002-2005 WRX.
