The only thing we had to do in order to make the factory computer happy was bump up the injector size. From ’91-’06 Jeep changed the fuel pressure just about every year, so depending on the year of your Jeep you will likely need different injectors than we used. We had an aftermarket regulator on the Jeep, which bumped us from the stock 39 psi to 45 psi as measured at the rail. So, instead of swapping 26 lb/hr injectors for our factory 19 lb/hr units, we put in 24 lb/hr injectors. If you have an aftermarket pressure regulator like we did, you will also want to measure the pressure at the rail before ordering injectors. We used Accel injectors that we got from Summit Racing.