As the title suggests, my car has been booked in for Friday to get Custom Tune done. I have searched the forums for information on Injectors and Custom Tunes but have came up with info other than required. I want to know if it is advisable to get the injectors changed whilst the car is there being tuned or leave the factory bosch ones in? What injectors should I get if needed, Bosch or Siemens and how much are they? Will this gain extra Kw's or should I do this change after IC, CAI, Exhaust is done? Car is completely standard with no modifications - as yet! Thanks Dean