I'm thinking about getting performance cams. I' m very curious about reprograming ECU after putting cams such JWT and Tomei. My car is already equipped JWT ECU with modified MAF. Do I really need to reprogram ECU with cams? Also, does anyone know the performance shop which can do excellent job on G20s in IL? The shops that I know don't really know how to put camshaft and cam gears on G20s.