what bhp are Siemens 55lb, 72lb and 83lb injectors rated for and do they need a special fitting kit. Also what resistance are they supposed to be? 2.8 Ohms????just wondering as i can get hold of some fairly cheap and was wondering which ones would be good for about 400 bhp with a view to upgrading later for more power but dont want to have to buy more injectors.They are for an escos.