reduces interior noise? I'm sure I read on here someone fitted one and it reduced the interior noise.

Although I haven't tried the fiat boot liner I would say not. I've been experimenting with the boot floor and actually not much makes a difference - got a close fitting sheet of 12mm MDF in there sandwiched between felt at the mo, no different to without. Most the noise in the car is sourced from the rear wheel arches IMO.

I find most of the noise in my 500 comes from either the stereo, or the 16v screaming at 5000rpm

Drive with the rear seats flat if you want to hear real noise ! and it is from the wheel arches.

roadster1_98 said:

reduces interior noise? I'm sure I read on here someone fitted one and it reduced the interior noise.

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Can't say that I have noticed any difference in sound levels since fitting mine, but it is useful, already caught a spillage that would have ruined the carpet.

nuovapanda said:

I find most of the noise in my 500 comes from either the stereo, or the 16v screaming at 5000rpm

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I also have fitted one but no reduction

It was me. I went in a 500 with one fitted and it was quieter than mine, but that could have been down to the tyres.

I would take jj's word as gospel with all the research and work he has carried out.