Why do you want to replace them anyway?????
Injectors are not something to replace just for the heck of it. If you're really bored you can pull the fuel rail apply pressure, if any leak -replace them. Or check the spray pattern, if they don't spray well -replace them.
You don't just look down and say, "hey them thare injectors luk' old, lets replace em' awl." DERF.
Have them cleaned if you want, replace the seals if you want, but don't replace them just becasue.