When I talk tuning I mean the actual tune on the car. Timing, TPS setting, and fuel pressure are critical. Then you get into other stuff like plugs and wires, making sure your cap and rotor are working properly, the right stat and operating temp.....there's a lot to it. I would estimate that 8/10 guys that get chips don't need them. I think that most, not all, NA guys that get chips don't need them.