When looking to tune your K-series and upgrade the fuel delivery system, the OEM Acura RDX injectors are an excellent upgrade. The RDX injectors flow an incredible 410cc (39lb/hr) and have excellent atomization characteristics over any other OEM injector. Depending on the application, we've seen an increase of about 2 lbs of torque at the wheels and approximately 3-4 hp on the upper end of the rpm spectrum. This torque and power increase in attributed to better atomization, as the fuel has a much finer mist.
However, we highly suggest to have the vehicle tuned when upgrading to these injectors. For instance, when we installed them on a an 2008 Civic Si without tuning, the ECU threw an error code that the car was running to rich. We ended up losing some top-end power and just wasted fuel. These injectors are great if you need them to fulfill the fuel requirements of your application. Sold in a complete set of 4 injectors.
Note: slight modification to the injector clip is needed to fit the harness.