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My car is fairly loud (no cats but double resonators), not ridiculous but still loud inside. It's not like a Mercedes but the difference is noticeable. Less noise, tighter audio sound. It seems like the kind of thing that only works with a large area of coverage, you can't just hit problem areas (I did above my wheel wells for road noise and I don't think it did anything). If you care about your audio, I would recommend it.
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