24lb injectors

if you are running over 300hp then yeah, you would benefit. if you are running a stock or close to stock set up then you wont notice any difference.
 
Injectors don't make HP. They just give your engine more fuel so that your supporting engine modifications can perform to peak levels.

If you are near stock, your 19s are fine and going to 24's won't do anything.

If you are around or above 300HP, 24's will just allow you more fuel and give you a safety factor. You'll only see a bump in power if your 19's were starving your engine at that point