I agree. I have the 12" with hfcs and I think its great for my loudness likes, but there is drone inside the cabin. The 18"s with hfcs might be more to your liking. Need someone with this setup to chime in.
As far as the smells, I only smell it when I get on it from being stopped but it only lasts a second. And it comes with that "hissing" sound but it gives the car personalitly lol
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