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Bilstein cars with PASM
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
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
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII Turbo 2010-13
Bilstein Replacement for the Original Spec
Fits:
Porsche 997 C4 / C4S / Turbo - For vehicles with PASM, For vehicles with electronic suspension control
B4 High Quality direct replacement shock absorbers constructed and finished to Bilstein's high standards often far and above what the car was originally supplied with. They can actually be a performance improvement if replacing plain, none gas charged, oil filled dampers. They dramatically reduce cavitation / oil foaming, thus give for more stable damping forces when driven 'spiritedly'. Some surprising cars come with plain oil filled dampers.
Key Features:
- Twin Tube Damper
- Gas pressurized
- OE damping forces
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
BILSTEIN9974B4P
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII Turbo 2010-13
Bilstein Sports B6 front and rear shock absorbers for Porsche 997 Carrera 4, Carrera 4S and Turbo models from 07/2004 with electronic suspension control, offering PASM-compatible damping tailored to these all-wheel-drive 911s.
What This Product Does These Bilstein B6 Sports dampers replace the original front and rear shock absorbers on PASM-equipped 997 C4, C4S and Turbo models. They are designed to work with the factory electronic suspension control, helping maintain consistent damping behaviour across selected modes while renewing worn or leaking original units.
Functions
- Support PASM-equipped suspension with compatible damping characteristics
- Control vertical wheel and body movement over bumps
- Help maintain stable tyre contact with the road surface
- Assist in keeping the car composed during braking and acceleration
- Work with the factory control system to vary damping by mode
- Contribute to a tidy, well-maintained suspension setup when refreshing other components
Symptoms of Fault
- Excessive bouncing or floaty, unsettled ride
- Knocking noises from the suspension area over bumps
- Visible oil leaks on the damper bodies
- Uneven or accelerated tyre wear
- PASM warning messages or inconsistent behaviour between modes
- Car feeling less composed in quick direction changes
Why Replacement Matters Over time, PASM dampers can suffer from internal wear, oil leakage and age-related deterioration, especially on higher-mileage 997 models. Replacing tired units with PASM-compatible Bilstein B6 Sports shock absorbers helps restore predictable damping response so the adaptive system can function as intended. This supports stable handling, consistent behaviour between modes and a more cohesive feel when combined with service items such as mounts and bushes.
Fits
- Porsche 997 (911) MK1 2005–2008
- 997 MK1 Carrera 4 3.6L 2005–08
- 997 MK1 Carrera 4S 3.8L 2005–08
- 997 MK1 Turbo 2007–09
- Porsche 997 (911) MK2 2009–2012
- 997 MKII Carrera C4 3.6L 2009–12
- 997 MKII Carrera C4S 3.8L 2009–12
- 997 MKII Turbo 2010–13
FAQs
- Do these work with PASM?
They are intended for Porsche models with electronic suspension control and are designed to operate with the PASM system when correctly matched to the vehicle. - Should dampers be replaced in pairs or as a full set?
They are typically renewed in axle pairs (both fronts or both rears), with many owners choosing to replace all four at the same time on higher-mileage cars. - Is an alignment required after installation?
An alignment check is usually recommended after suspension work to confirm geometry is within specification. - Anything else to replace at the same time?
It is common to inspect and, if necessary, renew top mounts, bushes and any worn hardware while access is available.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
SUSPENSION.997.B6KIT
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
Bilstein Replacement for the Original Spec
Fits:
Porsche 997 C2 / C2S / C4 / C4S - Car with PASM electronic damper control (I475)
B4 High Quality direct replacement shock absorbers constructed and finished to Bilstein's high standards often far and above what the car was originally supplied with. They can actually be a performance improvement if replacing plain, none gas charged, oil filled dampers. They dramatically reduce cavitation / oil foaming, thus give for more stable damping forces when driven 'spiritedly'. Some surprising cars come with plain oil filled dampers.
Key Features:
- Twin Tube Damper
- Gas pressurized
- OE damping forces
Please Note:
Price is for each damper you will need to buy 2
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
26-147543
The product you are viewing cross references to these numbers
Bilstein with PASM
At Design911, we supply Bilstein dampers specifically for Porsche models equipped with PASM (Porsche Active Suspension Management), helping you retain the factory adaptive damping functions while renewing tired or faulty suspension components.
Bilstein with PASM
Bilstein PASM-compatible dampers are designed to work with the original Porsche adaptive control system, so your Comfort/Sport modes and dashboard controls continue to operate as intended while you restore ride control and stability.
Why do Bilstein with PASM matter?
On PASM-equipped Porsche models, the dampers are closely integrated with the car’s control systems. When they age or fail, you can experience warning lights, inconsistent behaviour between modes, or a loss of the balanced feel the car had when new. Using PASM-compatible Bilstein units allows you to renew worn components without deleting or bypassing the adaptive features that are central to how these cars drive.
- Keep your Porsche PASM system operating as Porsche intended, with working mode selection
- Restore consistent, controlled damping where original units are worn or leaking
- Address PASM-related fault messages when the damper itself is the underlying issue
- Support long-term enjoyment and confidence in PASM-equipped Porsche models
Individual replacement dampers
Bilstein PASM-compatible units that allow you to replace only the affected corners or axles on your Porsche while retaining the factory control strategy.
- Suitable when one or more original PASM dampers is leaking or faulty
- Lets you keep the rest of the suspension close to standard specification
- Useful for targeted renewal on higher-mileage cars
Matched axle sets
Dampers supplied for a full axle (front or rear) so that both sides are renewed together for consistent behaviour and response.
- Helps maintain even damping left to right
- Reduces the risk of mixed wear levels on the same axle
- A sensible choice when carrying out planned suspension refresh work
Complete suspension packages
In some cases, PASM-compatible Bilstein dampers are combined with associated hardware or other suspension components to simplify a more extensive refresh or upgrade.
- Brings key parts together in one package for convenience
- Supports more comprehensive suspension restoration on PASM-equipped Porsche models
- Useful when working on higher-mileage or heavily used cars
Brands available in this category
For this category we stock a wide choice of trusted brands for Porsche models. You can also browse and filter by brand on this page to focus on your preferred manufacturers.
- Bilstein – PASM-compatible dampers developed for Porsche models with factory active suspension, aimed at maintaining the intended balance between comfort and control while renewing worn components.
When should you review or replace your Bilstein with PASM shock absorbers?
On PASM-equipped Porsche models, it is worth paying attention to how the system behaves and to any changes in ride or dashboard messages. Because the dampers are managed electronically, issues may show up as both physical symptoms and warning lights.
- You see PASM warnings or mode-related fault messages on the dashboard
- Damping feels inconsistent between modes or appears stuck in one behaviour
- There are knocks, leaks or obvious signs of wear at the dampers themselves
- The car no longer feels as composed over bumps as it did, despite correct tyres and geometry
If any of these apply, it is a good time to inspect the PASM system and associated components. When the fault traces back to the damper units, replacing them with PASM-compatible Bilstein parts can help restore normal behaviour while retaining the original functionality.
Explore Bilstein with PASM with Design911
Browse Bilstein options for PASM-equipped Porsche models at Design911 — from individual replacement dampers to axle sets — and find solutions that work with your car’s existing adaptive suspension control while renewing tired components.
