I have removed the asphalt sheets from the floor in my supra. The floor, roof, hatch, firewall, doors, and whatever else was dynamated and dynalined on top. I also drive a 98 Lexus GS300 and i can say that my Supra with open exhaust is just as quiet inside. I have had 3 sets of car audio systems in it. Pioneer, Excelon, and Eclipse XA and PA series amps. I also tested CDT, Kappas, Eclipse and E.O.S. front stages along side IDQ v.3 and CDT subs. All of these components gave very different signature of sound. Now, back to the point. The road noise can be easily removed if desired and Hi-End won't be a waist of money. However, in my subjective opinion, it makes sense only if you an audiophile. I have played piano since I was 5 years old and I do invest money on things like tube amps, naturally sounding speakers and so on. People do perceive sound differently. I also have friends that run circuit city stuff in their cars and boast of it, they also love the way MP3s sound, so for them tubes don't make much sense. Not necessarily a bad thing, just different. There is an outlet in Supra world for super hi-end if sound is your obsession and you just have to have it in a Supra, but in the majority of cases it really doesn't make much sense or difference.