There is no clear cut answer since what may fit on one car without mods, may require the rear seatbelt bulges flattened on another. Suspension type, height, rear brake types, all affect slightly.
YO 17" rims aren't terribly large, designed to fit these cars. They also have the custom type with separate hoops, but no need to alter the backspacing if you don't need to. I have the original one-piece YO R17's 285/40 on rear without mods and still some room, 255/45 on front and at full lock they just touch on the sway bar, but I also have custom steering so that's not helpful to you. New sports springs, sits maybe an inch lower each end. That's not even close to extreme, fairly common combo. You probably can't get those sizes on a Camaro due to the way their guards flare over.