So how did we do in noise reduction? With the interior re-installed, and cruising at 65mph (same stretch of road, same gear) I measured 85 dB, while at idle I measured 78 dB. In our first introductory article, we said the noise level in the untreated car was 93 dB, so we got an 8 dB reduction. What you really notice while driving is the expansion joints on the freeway are no longer noticeable, and there is no drone from the tires. The products also eliminated all the rattles, buzzes, and other audible noises in the car.

It's hard to beat these kind of results, in a convertible no less. Remember, the dB scale is logarithmic, so 8 dB represents a huge reduction in noise.

Read the entire review here