| As you can imagine, both product lines perform well. A simple upgrade like treating your car's doors, significantly reduces road noise while improving the sound quality of your stereo system . We suggest Door Kits as a bare minimum upgrade. You will be pleasantly surprised at the results. **Even a small amount of damping material can have a profound effect on noise reduction. In a typical application, applying damping material to the doors of your vehicle can reduce road noise up to 6 dB! This is a huge reduction in noise. Complete coverage for an average vehicle can reduce road noise as much as 18 dB! |