Spec 99-01 Porsche 996 3.4L Aluminum Flywheel
The SPEC SP90A is a billet aluminum, single-mass flywheel for the 1999-2001 Porsche 996 Carrera with the 3.4L flat six. Most owners shopping for it are dealing with one of two things: a factory dual-mass flywheel that has started to rattle at idle or clunk on takeoff, or a clutch job where they would rather swap to a lighter flywheel than pay for another dual-mass unit. SPEC lists the SP90A at 14 lb and builds it with a replaceable friction surface, so it can be refreshed at the next clutch change instead of being thrown away.
In the 996 the flywheel bolts to the back of the crankshaft and gives the clutch disc its rear friction face. It also stores rotating energy, which smooths out idle and makes pulling away from a stop easier. Porsche fitted a dual-mass flywheel, with two halves joined by springs, to soak up crankshaft torsional pulses before they reach the gearbox. That is why SPEC describes its own 996 Stage 1 clutch as built for use with OE dual mass flywheels. The SP90A replaces that assembly with one solid billet piece. The result is quicker revving and fewer parts to wear out. The trade-offs are more gear rattle at idle, a little more care needed when launching from rest, and more drivetrain noise in daily driving.
A worn dual-mass flywheel can be checked with the gearbox removed by rocking the two halves against each other; excessive free play or a grinding feel means it is done. Before that, rule out the simpler causes. A slipping clutch shows up as engine speed rising without road speed in a high gear, which our slipping diagnosis guide walks through. Engine-mount and exhaust-hanger knocks are often blamed on the flywheel, and our list of symptoms shops often misdiagnose covers how to tell them apart. If oil is present on the old clutch, find the leak first or it will ruin the new parts.
This listing covers the Porsche 996 Carrera 3.4L, 1999-2001. SPEC also lists the same SP90A for the 2002-2004 996 C2 and C4, the 2005-2008 997.1 C2 and C4, and the 2009-2012 997.2 Base, S and GTS when used with a SPEC billet flywheel and 996 clutch kit. It is not the part for the 997.1 3.8L S and C4S, which SPEC covers with a separate number, and it does not fit the 996 Turbo or GT models. Because the clutch must be one designed for a single-mass flywheel, match your planned clutch to it or send us your year and VIN before ordering. Other drivetrain hardware is in our hard parts section.
| Brand | SPEC |
| Part number | SP90A |
| Fits | Spec 99-01 Porsche 996 3.4L Aluminum Flywheel |
| Vehicle fitment | Porsche 996 (1999-2001) |
| Type | Flywheels |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Yes, SPEC lists it for the 1999-2001 996 with the 3.4L engine, as well as the 2002-2004 996 C2 and C4 and the 997.1 C2 and C4. It does not fit the 996 Turbo, GT2 or GT3.
SPEC lists the SP90A at 14 lb. It is a single-mass billet aluminum flywheel with a separate friction surface.
Use a clutch built for a single-mass flywheel. Some kits, such as SPEC's 996 Stage 1, are listed only for the OE dual-mass flywheel. Tell us your planned clutch and we will confirm the pairing.
Usually yes. Removing the dual-mass springs lets more crankshaft pulses reach the gearbox, so expect some gear rattle at idle. Most owners find it acceptable for the sharper throttle response.
Yes. SPEC sells a diamond-ground replacement friction plate with self-locking fasteners for its billet aluminum flywheels, so the flywheel can be refreshed at the next clutch change.
