I just ordered my UUC System U exhaust from one of our site sponsors, MPerformance (http://www.mperformance.com)
I'm pretty sure UUC is backordered though so it might take me a few weeks to get it in. I can't wait.
And actually I can say the checkout process on MPerformance was very fast and simple. I do recommend them and you can't beat the lowest price I've found on any other online store selling uuc, plus free shipping!
If you guys are looking into buying anything, check them out.