BMW 1 Series F20 F21 LCI Rear Heat Insulator Silencer 7427433

BMW 1 Series F20 F21 LCI Rear Heat Insulator Silencer is an original body component designed for installation in the rear section of the vehicle. It provides effective thermal protection and reduces noise coming from the exhaust system and chassis area, improving acoustic comfort inside the cabin. Thanks to its factory-fit design for the LCI facelift 1 Series, it serves as a practical solution for post-accident repairs, exhaust system maintenance, or rear bodywork reconstruction.

Specifications and technical data

• SKU: 7427433
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7427433
• Substitutable numbers: 51487427433, 7427433, PK
• Location on the vehicle: Rear
• Category: Other Exterior Parts & Accessories

Purpose and function in the BMW 1 Series F20/F21 LCI

The presented BMW 1 Series F20 F21 LCI Rear Heat Insulator Silencer is a component dedicated to the compact BMW 1 Series F20/F21 generation models after the LCI modernization. Mounted in the rear part of the body, it operates in the immediate vicinity of the exhaust system and the trunk floor, where it is responsible for:

• reducing heat transfer from hot exhaust system components to the body structure,
• limiting vibrations and noise coming from the rear part of the chassis,
• acoustic stabilization of the interior at higher speeds and under load.

Thanks to a design compliant with factory BMW standards, this component maintains the correct geometry and mounting points, which facilitates installation and ensures proper cooperation with other rear body zone components.

Construction and technical properties

The BMW 1 Series F20 F21 LCI Rear Heat Insulator Silencer has been designed as a body part that operates under demanding temperature and mechanical conditions. Its construction combines the function of a heat shield with noise dampening, which allows for:

• protection of bodywork elements against long-term exposure to high temperatures,
• reduction of noise and resonance levels generated by the exhaust system and suspension,
• maintaining stable operating conditions in the rear part of the vehicle, especially during highway driving.

As an original BMW component, the insulator maintains a proper fit to the shape of the floor and body, which minimizes the risk of incorrect installation and unwanted gaps that could cause additional vibrations.

Vehicle placement and service application

The component is intended for installation in the rear part of the vehicle, in the floor and chassis zone of the BMW 1 Series F20/F21 LCI. In workshop practice, it is primarily used in situations where:

• mechanical or thermal damage to the existing shield has occurred,
• after a collision or exhaust system repair, it is necessary to reconstruct the factory thermal protection,
• additional noises or resonances from the rear of the body appear, related to the absence or deformation of the insulator.

Proper placement and installation of this component are important for acoustic comfort, as well as for the durability of paint coatings and structural elements in the rear part of the body.

Characteristics of the used product

The offered insulator is a used part, sourced from a dismantled BMW vehicle. Such body components, when in appropriate technical condition, allow for economical repair without sacrificing factory fitment. In the case of heat and sound insulators, it is particularly important to maintain the integrity of the structure and mounting points, which enables trouble-free installation in place of the original element.

If you are considering a choice between new and used body components and want to better understand the differences in costs, durability, and availability, the following article may be helpful: Car parts – new or used? We compare costs, quality, and durability.

Compatibility, identification, and additional resources

To correctly select the BMW 1 Series F20 F21 LCI Rear Heat Insulator Silencer for a specific version of the BMW 1 Series F20/F21 LCI, it is worth verifying the manufacturer's markings and vehicle data in the service documentation. Original BMW markings facilitate part identification and minimize the risk of purchasing an incompatible element, which is especially important for body components with specific geometry.

If you are planning a comprehensive repair or upgrade of the rear body zone in your BMW and need other elements from the same group, such as additional shields, soundproofing elements, or small mounting components, check the available parts in the Other BMW category.

For a comparison of the characteristics of sports powertrains, braking, and chassis systems with standard solutions, you can also read the article: Audi RS vs other models – what is hidden under the hood and chassis?, which discusses structural differences using Audi RS models as an example.