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All the test pipes will introduce some rasp to the exhaust note. If you want less rasp go with ART pipes or HighFlow cats. If you want zero rasp you may want to stick with your stock cats. That being said, you won't hear the rasp all the time, just in the mid RPM while you are accelerating hard. They will make power and make your exhaust note a little louder. I've used them with the stock exhaust and a Magnaflow exhaust.
I will send you a paypal request. This will come in the form of an email. You will have different payment options through the paypal interface. Once you have chose an option and make the payment I will ship you the test pipes and give you the tracking number.