I was wondering if anyone had tried a spray-on soundproofing product on their G. It's definitely a quieter car than my Sentra, but it's still a little louder than I'd like at highway speeds. I'm going to line my trunk with some sort of soundproofing material, but I was thinking about using something like QuietCar to spray inside the wheel wells and (possibly the under-carriage?). I just wanted to check and see if anyone had tried anything like this. I'd rather not rip out the carpet to line the interior, if spraying underneath the car or the wheel wells would help almost as well. I haven't found much info on G20.net regarding soundproofing, so I thought I'd ask.