ECS Tuning B8 A4 / S4 Direct-Fit Trunk Sound Deadening Kit

Engineered specifically for the B8 A4 and S4, our Form-Fit Trunk Sound Deadening Kit is designed to reduce the transmission of road noise, chassis vibrations, and irritating exhaust drone. Increase comfort, eliminate road noise, and enjoy a more comfortable ride!

Pre-cut and precisely labeled, each multi-piece section of this sound deadening kit is tailored to the contours of the B8 S4 trunk, including the floor and spare tire well. Installation couldn't be more simple: peel and stick—no cutting, no trimming, and no guesswork required. The included 4mm thick sound deadening material includes exact cutouts for all trunk obstructions—wiring, mounting studs, clips, and more—ensuring a true factory-level installation.

Tested across four independent conditions, our Form-Fit Trunk Sound Deadening Kit achieved an overall noise reduction of 5 to 14 decibels, a significant drop you can hear and feel!

FEATURES

• Our exclusive Form-Fit design requires no cutting or trimming, and it installs cleanly with a factory-like fit

• Pre-cut layout is specifically designed for the B8 A4 and S4 trunk floor and spare tire well

• Multi-piece, labeled sections for intuitive, guided installation

• 4mm peel-and-stick material features durable adhesive backing for long-lasting performance

• Precision cutouts accommodate all factory wiring, studs, and clips

• Our testing revealed a 5–14 dB drop across four test environments (average reduction of 9 dB)

INSTALLATION & SUPPORT

Looking for installation tips? Look no further! Our team has assembled a detailed start-to-finish guide to ensure simple installation. See the "Installation" tab above for more information.

PRODUCT DEVELOPMENT

Our Form-Fit Trunk Sound Deadening Kit was designed, engineered, tested, and quality inspected by our Research and Development team at our Wadsworth, Ohio, facility. We strive for the highest level of precision and quality through leading-edge product development technology, including FARO laser scanning for reverse engineering and quality inspection, SolidWorks 3D CAD modeling, rapid prototyping utilizing our in-house 3D printer, and rigorous long-term product testing.