# 21999539 Inlet Silencer | Genuine Volvo Penta Part

🔧 Product Description

  

Genuine Volvo Penta Supercharger Inlet Silencer - Part Number: 21999539

  

Inlet silencer used in the mechanically assisted charge-air system on selected D11 marine engines. It reduces supercharger intake noise while maintaining the low-restriction airflow required during low-speed boost operation.

  

⚙️ Key Features

  

• Low-restriction intake airflow path

• Acoustic attenuation matched to the supercharger system

• Designed for the original air inlet and supports

• Resists vibration and intake pulsation

• Correct sealing prevents unfiltered-air entry

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 21999539 (current listed OEM reference)

  

OEM / Related Numbers:

  

• 21999539

• 21145185 - supercharger

• 22003447 - air inlet

• 21308577 - gasket

• 21621971 - air outlet

• 21211439 - support bracket

• 21451746 - pipe

• 21832376 - hose

• 996675 - clamp

• 981021 - drive belt

• 21422765 - belt tensioner

• 21452524 - belt protector

• 22024624 - bracket

• 3887305 - idler

• 3818176 - hub

  

Aftermarket / Verified Equivalents:

  

• No aftermarket equivalent

  

🚤 Compatibility

  

Commonly used on:

  

• D11 mechanically assisted charge-air / IPS compressor system

  

Typically suits:

  

• Engine models:

  

• D11B2-A MP

• D11B4-A MP

• D11C2-A MP

  

• HP / Rating: Controlled by the complete engine or drive product number

  

• Engine / System Type: Inline six-cylinder turbocharged and supercharged marine diesel

  

• Year Range: Production-build controlled; confirm by product and serial number

  

• Serial / Specification Control: Confirm the D11 model suffix, supercharger installation and serial number. The silencer must match air inlet 22003447 and supercharger 21145185.

  

🔌 Function

  

Reduces intake and supercharger noise while directing clean air into the forced-induction system with minimal restriction.

  

Common signs of failure or wear:

  

• Cracking or loose mounting

• Air leak or unfiltered-air entry

• Increased intake noise

• Restriction from contamination or internal collapse

• Chafe damage at adjoining pipework

  

📦 Condition

  

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 2945.5 AUD
- **Vendor:** Volvo Penta
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 2945.50 AUD | In stock |

## Images

- 21999539 Inlet Silencer | Genuine Volvo Penta Part

---

> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21999539-inlet-silencer-genuine-volvo-penta)
> Updated: 2026-08-03