SPEC part number SB533H is the Stage 2 Plus clutch for BMW's N54 3.0L twin-turbo six. Stage 2+ swaps the Stage 2 Kevlar disc for SPEC's multi-friction disc, which SPEC says maintains the excellent drivability of Stage 2 while adding 15-20% more torque capacity. For the E9x 335 applications SPEC specifies this kit as a rigid-hub disc.
The practical difference between this kit and SPEC's Stage 2 SB532-2 is what it bolts to. SB533H is the ratcheting assembly, listed by SPEC for use with the OE dual-mass flywheel or an aftermarket billet flywheel cut to the OE clutch pattern, so no flywheel purchase is forced. SB532-2, by contrast, is non-ratcheting and mandates a SPEC billet single-mass flywheel. Choose SB533H if you are keeping the factory flywheel and want the higher-capacity multi-friction disc. SPEC Stage 2+: multi-friction disc, 15-20% higher torque capacity than SPEC Stage 2. Ratcheting pressure plate, runs on the OE dual-mass flywheel or an aftermarket billet flywheel with the OE clutch pattern. No flywheel is included, and for most listed applications none is required. SPEC application coverage for this part number spans BMW 135, 335 (E9x), 335is, 535 (E60), 550 (E60/F10), 650, X3 (F25) and Z4 35i. SPEC rates Stage 2+ for street, drag, pulling and autocross use. Sibling part: SB532-2 is the Stage 2 Kevlar version, and it requires a SPEC billet single-mass flywheel.
Specifications
| Stage |
Stage 2+ (SPEC “Stage 2 Plus”) |
| Disc Material |
Multi-friction |
| Sprung or Rigid Hub |
Rigid hub (BMW 335 E9x applications, per SPEC) |
| Flywheel Required |
No — runs on the OE dual-mass flywheel or a billet flywheel with the OE clutch pattern. Flywheel not included. |
| Street/Strip Use |
Street, drag, pulling, autocross |
| Part Number |
SB533H |
This part fits:
| Year |
Make |
Model |
Submodel |
| 2008-2009 |
BMW |
135i |
Base |
| 2007-2009 |
BMW |
335i |
Base |
| 2009 |
BMW |
335i xDrive |
Base |
| 2007-2008 |
BMW |
335xi |
Base |
| 2008-2009 |
BMW |
535i |
Base |
| 2009 |
BMW |
535i xDrive |
Base |
| 2008 |
BMW |
535xi |
Base |