Well, you still need to drive it around awhile to see how you like it, its not like you just rip it off then drive to the end of your block and you'll be able to tell if you like it.
Drive for an hour or so and see if you feel anything different, then drive a bit on the streets and see if the higher noise level attracts any more attention, so you know what you'll be in for.
I got quite a few looks from cops and other imports/domestics after i did it to my wrx, i'm certainly an attention whore, but i dunno if thats your style.