I was wondering what theoretical HP improvement I would get with using oversized injectors / AFC / Intake.

Would this be a cost effective upgrade to add HP?
An easy DIY?
Would I even get more HP?
Will it kill my gas milage?

 

No benefit without FI, the car already comes running richer than it needs to if you use larger injectors you will get even richer. Running rich means less power and can lead to cylinder wash which can harm your engine.

 

even OEM injectors are good for ~7psi of boost. An intake doesn't provide that much more air over the OEM intake, when compared to a turbo/supercharger.
.

 

Great. Thanks guys.

I'll be waiting for an affordable FI option....SRT....RMM...hope somebody makes one soon.