97 vortec 350. I bought some midlength headers and need to take the truck to the shop to get the pipes refitted. My plan was to install the headers with the forward o2 sensors and egr hooked up and drive it down to the shop to get the headers replumbed to the cats. I realize it will be loud, but I do not want to pay labor rates for installing headers that I can do myself, and if I could I would weld up the exhaust myself but that is just not in my skill set right now. Will running it essentially without the rear 02's hurt anything if it is just down to the shop?