I done mine before @ Trial Tuning, can't recall how much (if this is your next Q)
You can remove your set of 4 injectors and bring it to them. Lazy to explain the process, in summary the injector spray evenly after the cleaning . You can see before and after process of your very own injector .. cc calculation is there too .. Enjoy ..
Google info : http://www.racq.com.au/motoring/cars/car_advice/car_fact_sheets/injector_cleaning