Wow thanks for all the replies, I havent quite gotten the car yet, I'm getting it thursday for my 18th birthday, ill definately crawl under and take a look, i get i would just want axelback for sound, cause i dont have 800$ to drop on a full exhaust and my dad wont let me take out the cats (******* lol).
I was also lookin at Corsa Xpipe, maybe ill just get that, I heard X-pipes just make it a bit louder or so, but yeah I understand about the driving on the highway, my friend has an SLP SS Camaro and it has the slp loudmouth exhaust and it gets quite annoying after awhile with how loud it is, but i plan on getting subs to blur out the exhaust (got the shaker 500 so gonna get louder subs than the shaker1000 - too used to ford subs since i was drivin an 02 mustang gt w/ mach1000 system - wasnt loud enough =P)
Also heard that the 05-06 is a bit quieter stock exhaust than the previous body style, might be true dont know, but certainly handles better than my 02 mustang! Got tons of ideas to do = ) I've been readin these forums and some accessories forums, just gotta keep it all under warranty hehe, I think I'm either gonna go for flowmaster/magnaflow or corsa Xpipe.