I pulled the carpet out of my Amigo when I first bought it used - apparently a rat lived under it at some point (there was still a nest) and the guys dog kept trying to dig through the carpet! Anyways, it smelled and looked horrible, so I took it and the white padding out. I didn't notice any noise increase, but it was new to me, so maybe I just didn't have time to get used to the carpeted version. Also, mine has rear air ducts, so it covers the wiring harnesses that are not in the door jams. Personally, I love the no carpet thing and just got a set of the "All weather" rubber catch all mats from Walmart and a matching cargo mat and it looks pretty good. I've even gotten several compliments on the "no carpet" look. Eventually, I might want to line-x it, but I have many other things I want to do before I drop $1k on rubber liners! The heat can be a little warm sometimes, but for the most part it is withstandable - just don't hop in the backseat barefoot!

One question I have, though, is has anyone opened the drainholes in the floor under the seats? I'd love to find a good plug and knock the tab out of those drains since that everytime I wash it I get water leaks and have no carpet to soak it up!