As well as improved vehicle acoustics this high performance multi-layer thermal insulator will ensure engine heat entering the cabin is reduced and can protect your bonnet from discolouration. High noise reduction & thermal insulation properties.
eBay
High Quality 1pair Universal High Efficiency Mini Dome Tweeter Loudspeaker 2x 500W Loud Speaker Super Power Audio Sound for car
Aliexpress UK
Isolator is best used together with Silent Coat Deadening Mat as a 2-layer solution to reduce and thermal transfer and airbourne noise. Silent Coat Noise Isolator 10 is a noise and thermal isolation material made using special closed structure foam technology.
eBay
A pair of 4x6-inch coaxial four-way car audio speakers, 500W maximum power, 50W RMS, high-power sound quality, 4 ohm impedance
Aliexpress UK
Sound insulation and foam insulation are used both inside and outside the vehicle. Suitable for insulation applications: Soundproofing Foam For Automotive Floor, Doors, Roof, Hood, Etc. It Uses A Waterproof Dense Closed Cell Foam.
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7-Sound Speaker Car Horn Police Siren Air Horn Megaphone 12V 100W Emergency Warning Alarm Loud Amplifier Hooter for Vehicle Safe
Aliexpress UK
It is very lightweight, fireproof, and waterproof. Soundproof mat location: A. Ceiling B. Living room C. Car door D. Cockpit floor E. Tailgate F. Rear wall and U-shaped wall J. Front fender H. Front wheel.
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"4" 5" 6.5" 8" Speaker Empty Box - Solid Wood 2-Way Enclosure for Car Audio & Outdoor Sound System DIY Upgrade"（1pcs）
Aliexpress UK
10m Sound Deadening Roll Car Van Heat Insulation 10mm Thick Closed Cell Foam UK. The sound deadening mat is 10mm thick, which is better than ordinary silencer cushions. Provides excellent acoustic insulation and soundproofing.
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1 Pair 4-Inch Coaxial Speaker (2X220W) Car Door Speaker Surround Sound Systems Music Players High-Fidelity Audio Speaker Woofer
Aliexpress UK
The high rebound soundproofing foam is made of two layers. One is made of low density part and the other is made of high density part. The two layers together effectively insulate noise with the foam cell structure for maximum sound absorption.
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For BMW Subwoofer Bass Mid Speaker Tweeter For F30 F32 F20 F10 G20 G01 F48 F34 X1 X2 3 Serise Audio Sound Car Door Speakers Horn
Aliexpress UK
The sound deadening mat is 10mm thick, which is better than ordinary silencer cushions. The automotive sound deadener consists of three layers. The middle layer is high-density closed cell foam, which has excellent sound insulation properties.
eBay
1 Pair T280 Universal Car Tweeter Speakers MAX 140W High-Power HIFI Sound Quality Music Stereo Loud High-Frequency Capacitor
Aliexpress UK
With adhesive cotton insulation, it can be installed in any part of the car, such as doors, roofs, floors, hood, trunk room, trunk lid etc. Material: Insulation Cotton Foam. 1 x Sound Proof Insulation Foams.
eBay
AIYIMA 1Pcs 8 Inch 150W Subwoofer Speaker 4 8 Ohm Hifi Speaker Audio Sound Loudspeaker DIY Car Modification Home Audio Upgrade
Aliexpress UK