Well, I'm about to make the switch from a mustang to the camaro (I know, I know, I feel ashamed I had the blue oval in the first place but the 5th gen wasn't out yet). I had a few questions about mods though. It seems modding the camaro and modding the mustang are just a tad different. First off, from what I gather when doing exhaust work, the cats are part of the headers? On the mustang their part of either the x or h pipe. Does anyone know if the Borla headers have cats? I love the sound of borla exhausts. Second, I've seen that GMPP has shorty headers. Now on the mustang any headers need a new tune, is that the same way with the camaro? Also, if i had the GMPP headers installed by my dealership, would they re-tune the car, and would the powertrain warranty still be intact? Any idea of what to expect in terms of power gains with an intake and full exhaust work? Are there any independent studies that have been done on intakes or exhaust systems?