[guruerror]

Let me see if I have this straight...the 08 you're going to trade has the GM Performance cat-back and the 08 you're planning on keeping appears to have the stocker that we've been researching? And you're thinking about switching the two exhausts so you can keep the cat-back?

If this is all correct, for me it would boil down to money and hassle. If the time, money, and trouble it's going to take to make the switch is substantially cheaper than putting an aftermarket set on later, then I'd say go for it. But if the costs (when all things are considered) are close I'd say just wait and put an aftermarket set on that you really like.