do they make a diffrence on non superchraged cars or do they make a difference at all.. other then look nice under the hood

 

Fuel rails, there purpose is to deliver MORE needed fuel...Stock rails are only like 3/8" were lets say aeromotive is like 3/4" persay.

So if your a N/A user with not much HP just basic bolt ons then they will be there to look pretty only.

Now if your Forced Induction (Turbo(s)/SuperCharged) running good power numbers then there is a rail upgrade NEED.

Hope this helps....