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since i see your getting gears later. just get a tuner/chip and get the rear 02's deleted via the tune and 02 extensions. that way you can turn you car for the new gears when you get them.
+1 if you have the cash, if not mils are preatty inexpensive. As far as o2 extensions I would also just buy those too. LT's FTW. What kind of catback are you goin with?