3" catback exhaust, no turbo.........YET!! Options

[celicaGT96]

ok, Im going for the 5sfte project, starting now, Im just buying parts here and there slowly. I should have everything in about 2 months. Im going with the 3" exhaust and magnaflow muffler, the only thing is..........ive been stuck with my boring stock exhaust, forever, and my cars already been kitted, painted, and all that jazz, and I want the custom exhaust system now.
So heres my question, Will my exhaust sound bad for the time being that I dont have my turbo installed, Does it even effect the sound?? Im just ready to get it now, and if it'll be fine than ill be on my way.

[presure2]

on a 5sfte 3" is overkill.
(trust me, i HAVE 3" all the way back"
you dont need any bigger than 2.5
that way, when the motor goes, you can go back stock without having to have your whole exhaust redone.