You will have to bend a fuel line slightly in order to remove stock injectors. Be sure to use a gas to lubricate o-rings before installing pink injectors.
Here are two stock injectors:
There are two 12mm bolts holding a fuel rail
Remove this 12mm bolt that's holding a fuel line on left side of injector closest to the front bumper.
Gently lift the fuel rail up with your left hand and use your right hand to pull down the injector to separate it from the fuel rail. Make sure to disconnect the harness from the injector first.