Originally Posted by zwalk
Even with a retune?
You HAVE to get a retune, you can't even drive the car without one. Injectors are one of those mods where the car probably won't even start if you don't have a tune for them, and even if it does start, you can do major damage by driving it untuned.
Injectors are just a support mod. They add zero power by themselves, they simply allow you to flow more fuel if needed. If you don't need more fuel, then they won't do anything.