can someone please tell me, do all SRT8's come with the rebranded Corsa catback exhaust? I have looked all over this and other forums, and cant seem to find the answer. If they do, why would anyone buy a Corsa catback for their SRT Chally? please, newbie here, so don't flame me. I am trying to find the best bang for the buck parts to "liven" her up a little..