Spec 07-10 BMW 335i/135i Stage 2+ Clutch Kit
SPEC SB533H is a Stage 2+ single-disc clutch kit for the twin-turbo N54 cars: the 2007-2010 BMW 335i and the 135i with the six-speed manual. It is aimed at the owner whose car has a tune, intake and downpipes, and now slips when the turbos come on in the upper gears, but who wants to keep the factory dual-mass flywheel and a pedal that still works in traffic. Unlike several SPEC kits for these cars, the SB533H does not require an aftermarket flywheel.
The N54 makes its torque low and early, and a few psi of extra boost is enough to push the factory organic disc past what its clamp load can hold. SPEC's answer here is two-fold. The pressure plate is uprated, and the disc uses SPEC's Stage 2+ multi-friction lining, which SPEC says keeps the drivability of its Stage 2 Kevlar disc while adding 15 to 20 percent more torque capacity. In practice that means smoother takeoffs than a puck-style disc and a friction level that stays put when the clutch gets warm.
SPEC lists this kit as a ratcheting design for these BMWs, the same self-adjusting idea BMW uses at the factory: the pressure plate takes up disc wear on its own so pedal height and engagement point stay consistent. For the E9x 335i, SPEC specifies a rigid hub disc. SPEC lists the kit's weight at 16 lb.
Rule out the hydraulic side first: a weak slave cylinder or air in the line can hold the clutch partly released and look exactly like slip. Then load it: fourth gear, about 2,500 rpm, full throttle, and watch whether engine speed outruns road speed. Our transmission slipping diagnosis guide covers that test, and flare vs. slip helps separate a slipping clutch from a shift that only flares. When the gearbox comes out, check the dual-mass flywheel for heat cracks and excessive free play; a worn flywheel will undermine any new clutch.
Our listing covers the 2007-2010 BMW 335i (E9x) and 135i with the N54 engine and manual transmission. SPEC's chart for SB533H is broader and also includes the E60 535i, the N54 Z4 35i and the 2011-2013 335is, among others. SPEC pairs it with the stock dual-mass flywheel or with SPEC billet flywheels, and those billet flywheels changed with production: SB53A or SB53S for cars built through January 2009, and the -4 versions for cars built from February 2009. If you plan to run SPEC's aluminum flywheel, the matching clutch is the SB533H-2, not this kit. DCT and automatic cars are not a match. Send us your year, production date and VIN if you are unsure.
| Brand | SPEC |
| Part number | SB533H |
| Fits | Spec 07-10 BMW 335i/135i Stage 2+ Clutch Kit |
| Vehicle fitment | BMW 335I/135I (2007-2010) |
| Type | Clutch Kits - Single |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
No. SPEC lists the SB533H for use with the stock dual-mass flywheel or a SPEC billet flywheel with the OE clutch pattern. The SB533H-2 version is the one built for SPEC's SB53A-2 aluminum flywheel.
Yes. SPEC describes the SB533H as a ratcheting clutch kit for these BMWs, so it takes up wear on its own. Install it with the correct SAC alignment tool.
SPEC's Stage 2+ uses a multi-friction disc with 15 to 20 percent more torque capacity than its Stage 2. Stage 3+ moves to a carbon semi-metallic full-faced disc for higher power.
SPEC includes the 2011-2013 335is on its chart for SB533H. Our listing is titled for the 2007-2010 335i and 135i, so send us the VIN for a 335is.
No. This is a single-disc clutch for six-speed manual cars only.
