RC Engineering fuel injectors are designed to directly fit the factory fuel rail on your 2003+ Dodge SRT4. They are available in 660cc and 750cc injector sizes to meet the fuel demands of even the biggest turbos. These are a great upgrade if your stockers are running out of fuel on the top end! Sold as a set of 4 Injectors with CLIPS! While these are a direct fit into the factory fuel rail, when using the included spacers, you will need to cut your stock injector clips off and solder in the RC clips. Due to the proximity of this wiring to your fuel system, we highly reccomend professional installation. This is a complete kit for the SRT-4, but you will need some sort of fuel management unit to run these injectors (i.e. an SAFC, E-Manage, Hydra EMS or a DTEC FC... OH YEAH, and AEM tells us the plug and play EMS is coming soon for the SRT-4). These injectors will not fit into aftermarket fuel rails (i.e. Perrin) and will require removal of the plastic engine cover. These injectors are designed to be run at 43.5 Psi of fuel pressure; the SRT-4 runs 58psi stock, so some sort of regulator or return-line system is required.