The only vehicles that you can really over-rev now a days are manual transmission vehicles. Otherwise, the programming will do everything in its power to ensure you don't damage the engine. If you're hitting critical temps, the computer will start dialing back your power. Today's modern metallurgy, lubricants and manufacturing processes have really increased the durability of these motors and allow them to operate at redline all day long. You should see the hell these engine endure when they get life-cycle tested on an engine dyno. How's running liquid nitrogen through your coolant passages after a full-bore high-tmep run sound?