BMW Z3 Door Soundproofing – Gradual Acoustic Upgrade for the Bimmer

We’re continuing the acoustic transformation of this classic BMW Z3! This time, our focus was on soundproofing the front doors, using high-quality materials: STP Black Silver deadening mats and Bitmat K3s sound-absorbing foam.

Previously, we soundproofed the trunk and rear wheel arches of this car – you can check out that project here.

Materials used in the door treatment:

• STP Black Silver – premium butyl-aluminum mat for effective vibration and external noise damping

• Bitmat K3s – sound-absorbing open-cell foam, perfect as a second layer in door soundproofing

Step-by-step installation process:

1. Removing the door panels and thoroughly cleaning the inner surfaces

2. Applying STP Black Silver mats to both the outer and inner metal panels

3. Adding a second layer with Bitmat K3s to fill cavities and improve noise isolation

4. Reinstalling the door panels while maintaining the OEM look

5. Testing – significantly reduced road noise and better cabin acoustics

Results of the door soundproofing:

• Noticeable reduction in road and wind noise

• Improved audio system performance

• Enhanced driving comfort in this stylish roadster

Want to reduce noise in your own vehicle and enjoy a quieter, more comfortable ride? We offer professional soundproofing of doors, trunks, floors, arches, and roofs using top-quality materials like STP, Bitmat, and CTK.

Sound Audio System
Zalesie 51K, 21-025 Niemce (10 km from Lublin, Poland)
📞 +48 534 346 658
📧 sound_audio_system@o2.pl
🌐 www.soundaudiosystem.pl