I was thinking the same. Loud is fun until you drive a 500mi trip like that at 75mph. Just something for the OP to consider, I busted the pipe off a minivan I drove (3.0l caravan) when I was 18 (accidental break, not intentional) and prompty got a 375$ noise and safety violation before I could even get to the shop :cheerl:
Better yet, get some audio of a top fuel dragster and run that through a PA system. Can you imagine the looks sitting at a stoplight soundling like a top fuely at idle?You're probably losing low end performance like crazy with your set up.
What about getting a PA system and just driving around playing static at full volume? That would be pretty loud and annoying.