Evan02

Would that negatively affect my gas mileage?

CalBoy101

If you don't get a tune it will definitely hurt your mileage and performance.

With a tune the gas mileage will be the same under light to medium throttle.

Your performance will only improve if the engine really needed the bigger injectors, if you are making under 260 or so rwhp then the 21's are good enough.

Datalogging your injector duty cycle at WOT and max RPM tells you if you need bigger injectors, if the current injectors are at 80% or less then you don't need new ones.

Soldier GT

What mods do you have?

Evan02

Nothing much really, just a couple of bolt ons. I don't plan on installing the injectors until I get a larger plenum and throttle body.

The only reason why I got the 24lb is because I got a really good deal on them.

uberstang1

Honestly dude there no reason to even run them, there not needed with those mods and there not gonna add anything, its just a waste even with the throttle body still dont need em.

Evan02

Thanks, I'll probably just save myself a head ache then