B4 shock absorbers & top mounts, REAR, SET OF 2. Porsche 997 C2 / C2S / C4 / C4S / Turbo 2005-12  ›  26-147543KIT.1

Bilstein B4 rear shock absorbers with top mounts, supplied as a set of two for Porsche 997 models equipped with PASM. This package combines replacement dampers and mounts for rear suspension renewal.

Fits

Porsche 997 C2 / C2S / C4 / C4S - Car with PASM electronic damper control (I475)

• 997 MK1 Carrera 2 3.6L 2005–08
• 997 MK1 Carrera 2S 3.8L 2005–08
• 997 MK1 Carrera 4 3.6L 2005–08
• 997 MK1 Carrera 4S 3.8L 2005–08
• 997 MK1 TURBO 2007–09
• 997 MKII Carrera C2 3.6L 2009–12
• 997 MKII Carrera C2S 3.8L 2009–12
• 997 MKII Carrera C4 3.6L 2009–12

What This Product Does

The dampers regulate rear suspension movement as the wheels travel over uneven surfaces. Their electronic control compatibility allows the factory PASM system to manage damping, while the top mounts provide the upper connection between each damper assembly and the body.

Functions

• Controls rear suspension oscillation.
• Works with the existing PASM damping controls.
• Connects the rear damper assemblies through their upper mounts.

Technical Details

• Product reference: VA7-E754. B4 replacement specification; rear axle set of two shock absorbers with top mounts.
• Supplied damper specification: twin-tube construction, gas pressurisation and original-equipment damping characteristics.
• 99733305325: I475 application for 997.1 Carrera 2 / Carrera 2S Coupé and Cabriolet, plus Carrera 4 / Carrera 4S, 2005–08; diagram quantity two.
• 99733304903: I475 application for 997.1 Targa / Targa S, 2007–08; diagram quantity two.
• 99733305337: 997.2 Carrera 2 / Carrera 2-S Coupé and Cabriolet, PR:475; Speedster, PR:029,475,503 and PR:475,503; Carrera GTS Coupé and Cabriolet, PR:011,475; 2009–12. Each diagram entry specifies quantity two.
• 99733305337: 997.2 Carrera 4 / Carrera 4-S Coupé and Cabriolet, PR:475; 4 GTS Coupé and Cabriolet, PR:019,475; 2009–12. Each diagram entry specifies quantity two.

Symptoms of Fault

• Repeated rear bouncing after road impacts.
• Oil seepage from a damper body.
• Knocking around the rear suspension mounts.
• Uneven rear tyre wear or an unsettled ride.
• PASM warnings or unexpected changes in damping response.

Why Replacement Matters

Renewing worn rear dampers together avoids combining different wear levels across the axle. Including top mounts allows these associated connections to be renewed during the same repair. Confirm the source of any noise or electronic fault first: bushes, links, wiring and connectors can produce symptoms similar to damper failure.

FAQs

Is this package intended for PASM-equipped cars?
Yes. The supplied application specifies electronic damper control, option I475.

Are top mounts included?
Yes. The package comprises two rear shock absorbers and top mounts.

Will replacement resolve every PASM warning?
No. A warning caused by wiring, connectors or another system component requires separate diagnosis.

Should alignment be checked afterwards?
Arrange a geometry check following suspension work, with adjustment where required.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

26-147543KIT.1

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