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Rear Sound Absorber. Porsche 993 1994-98 - 99355621
99355621
Vehicle Group
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
Information
Rear Sound Absorber.
Restore the acoustic performance of your Porsche with this genuine OEM sound absorber panel from Porsche. Designed for the body/trim of the 993 this part improves road-noise insulation, reduces rear-end rattles and helps maintain the quiet, refined cabin Porsche intended.
Fits:
Diagram Ref No 5
What This Product Does:
Symptoms & Signs You Might Need Replacement:
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99355621
The product you are viewing cross references to these numbers
Restore the acoustic performance of your Porsche with this genuine OEM sound absorber panel from Porsche. Designed for the body/trim of the 993 this part improves road-noise insulation, reduces rear-end rattles and helps maintain the quiet, refined cabin Porsche intended.
Fits:
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
Diagram Ref No 5
What This Product Does:
- A sound absorber in this context is a piece of material (panel, mat, liner) mounted inside the body structure (often rear wheel-house, rear body panel, underside or inner arch) that reduces transmission of road noise, exhaust noise, underbody noise, and helps improve cabin quieter ambience.
- It also helps with vibration damping and may assist in reducing resonance or panel noise from wheel wells or rear structures.
- So although it may be called “Rear Sound Absorber”, the role is acoustic & NVH (Noise-Vibration-Harshness) control rather than structural or driving component.
Symptoms & Signs You Might Need Replacement:
- Increased cabin noise, especially from the rear wheel well, rear body area, or under-carriage.
- Rattling or buzzing noises in the rear portion of the vehicle (especially with ageing inner liners or insulation panels) — the material may have detached or degraded.
- Visible damage or missing panel: The insulation mat or absorber might be missing, torn, sagging, wet (water ingress) or corroded substantively.
- Age and wear: Over time, especially on older 993 vehicles, insulation mats can break down, delaminate, or allow noise ingress compared to new.
- Improves cabin comfort: For premium vehicles like Porsche 911, maintaining a quiet interior is part of the driving experience. A degraded sound absorber reduces this comfort.
- Maintains NVH integrity: A whisking of rear-end noise, tyre/road noise or exhaust resonance can intrude into the cabin if the absorber is missing or ineffective. Replacing helps maintain factory spec.
- Prevents hidden issues: Sometimes, missing or degraded insulation allows moisture, road debris or dirt to encroach into body cavities, potentially causing rust or other unseen damage.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99355621
99355621500
99355621600
The product you are viewing cross references to these numbers
Prices from: €72.27
Related products
Vehicle Group
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
Information
Engine bay sound proofing damping mat.
This pad is installed in the engine bay to dampen noise, reduce heat transfer, and help maintain a quieter cabin. It’s made to match the original shape for a direct fit, offering effective sound insulation and thermal protection.
Fits:
Porsche 911 / 912 1965 - 1989
Diagram ref no 26
Location: In the engine bay, frequently mounted on the firewall or underside of the engine cover, replacing old or deteriorated insulation material
What this product does:
• Acts as a sound-dampening layer in the engine compartment
• Reduces engine noise entering the cabin
• Helps buffer heat, protecting nearby components and minimizing radiant heat transfer
With age, engine sound insulation pads can sag, crack, or break down, reducing their effectiveness at blocking noise and controlling heat. When this happens, more engine noise enters the cabin and heat may affect nearby components. Replacing the pad restores quiet cabin comfort and proper thermal protection in the engine bay.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91155689101
The product you are viewing cross references to these numbers
This pad is installed in the engine bay to dampen noise, reduce heat transfer, and help maintain a quieter cabin. It’s made to match the original shape for a direct fit, offering effective sound insulation and thermal protection.
Fits:
Porsche 911 / 912 1965 - 1989
Diagram ref no 26
Location: In the engine bay, frequently mounted on the firewall or underside of the engine cover, replacing old or deteriorated insulation material
What this product does:
• Acts as a sound-dampening layer in the engine compartment
• Reduces engine noise entering the cabin
• Helps buffer heat, protecting nearby components and minimizing radiant heat transfer
With age, engine sound insulation pads can sag, crack, or break down, reducing their effectiveness at blocking noise and controlling heat. When this happens, more engine noise enters the cabin and heat may affect nearby components. Replacing the pad restores quiet cabin comfort and proper thermal protection in the engine bay.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91155689101
91155689101
90155689120
901.556.891.20
901 556 891 20
911.556.891.01
911 556 891 01
90255689340
902.556.893.40
902 556 893 40
91155689100
911.556.891.00
911 556 891 00
90155689121
901.556.891.21
901 556 891 21
90255689121
902.556.891.21
902 556 891 21
90255689140
902.556.891.40
902 556 891 40
90255689141
902.556.891.41
902 556 891 41
90255689321
902.556.893.21
902 556 893 21
90255689420
902.556.894.20
902 556 894 20
90255689440
902.556.894.40
902 556 894 40
90255689521
902.556.895.21
902 556 895 21
90255689540
902.556.895.40
902 556 895 40
90255689621
902.556.896.21
902 556 896 21
90255689640
902.556.896.40
902 556 896 40
The product you are viewing cross references to these numbers
Price: €44.46
In stock
Vehicle Group
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
Information
Rear Panel Sound Proofing Damping Mat.
Fits:
Porsche 911 1970-89
Porsche 911 (930) Turbo 1975-89
Click 'Zoom in' for large parts diagram.
Diagram ref no 10-13
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99991300600
The product you are viewing cross references to these numbers
Fits:
Porsche 911 1970-89
Porsche 911 (930) Turbo 1975-89
Click 'Zoom in' for large parts diagram.
Diagram ref no 10-13
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99991300600
91155623906
The product you are viewing cross references to these numbers
Price: €187.52
In stock
Vehicle Group
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
Information
Interior sound proofing kit.
Complete interior sound deadening kit (8 pieces) to cover the rear bulkhead for all Porsche 911 models from 1965 through 1989. Pre-cut to original factory specifications. Manufactured from high performance self-adhesive bitumated plates for maximum reduction of rolling noise and vibration.
Due to age most original sound deadening has hardened, cracked and flacked off. Sound deadening in this state is a dangerous water trap. They can hide rust and will no longer provide adequate sound insulation. To protect against rust and ensure a silent comfortable ride we recommend you replace your old sound deadening before installing your new interior.
Our acoustic insulation kit is among the best available for performance, originality and fit. The kit is manufactured from high performance self-adhesive bitumated plates of 4mm thickness. The plates contain odor free additives and fillers to maximize reduction of rolling noise and vibration. Pieces in the kit are pre-cut to Stüttgart factory specifications.
Installation is easy. Ideal working temperature is 20-25°C. Make sure surfaces are clean and free from grease. Press sound deadening plates with the adhesive side on the surface after having removed cover material (paper or film). Warm up with a heat gun to shape the material in the form of your underbody. Press on with a roller to avoid air inclusions.
The kit contains all 8 pieces for the rear bulkhead. The sound proofing for the floorplan (4 pieces) can be added as an option.
Complete interior sound deadening kit (8 pieces) to cover the rear bulkhead for all Porsche 911 models from 1965 through 1989. Pre-cut to original factory specifications. Manufactured from high performance self-adhesive bitumated plates for maximum reduction of rolling noise and vibration.
Due to age most original sound deadening has hardened, cracked and flacked off. Sound deadening in this state is a dangerous water trap. They can hide rust and will no longer provide adequate sound insulation. To protect against rust and ensure a silent comfortable ride we recommend you replace your old sound deadening before installing your new interior.
Our acoustic insulation kit is among the best available for performance, originality and fit. The kit is manufactured from high performance self-adhesive bitumated plates of 4mm thickness. The plates contain odor free additives and fillers to maximize reduction of rolling noise and vibration. Pieces in the kit are pre-cut to Stüttgart factory specifications.
Installation is easy. Ideal working temperature is 20-25°C. Make sure surfaces are clean and free from grease. Press sound deadening plates with the adhesive side on the surface after having removed cover material (paper or film). Warm up with a heat gun to shape the material in the form of your underbody. Press on with a roller to avoid air inclusions.
The kit contains all 8 pieces for the rear bulkhead. The sound proofing for the floorplan (4 pieces) can be added as an option.
Delivery Time is Normally 3-4 weeks on this product as this is made to order
Price: €462.15
Orderable