Okay I did search, spent 1/2 hour looking. couldnt find a for sure answer. I see people doing the DIY stock fuel rail dual feed mod.

Is this something that needs to be done for 250whp or are people being paranoid ?

 

Short answer: NO

You are completely fine with the stocker.

Long answer: check my previous build thread and many others just like it: over 300whp, e85, and stock fuel rail doing just fine with no drama. In fact, AbeFM (or maybe someone else, I'm drunk ATM) did a test and disproved the bs claim about "needing" a dual feed rail on our cars.

 

DIY dual feed isn't worth doing at all. The benefit comes from a larger bore which allows you to maintain a stable, higher pressure even when you have big injectors running at high duty cycle.