I am the owner of an OZ that may trade up to an Evo. I have searched for this but not much luck..... I know the Evo's injectors are 550's - would adding a Walbro fuel pump, 660 cc injectors, and a Perrin fuel rail make the car run rich ?? I am going to add more air and an exhaust as well but i was just curious about this. Thanks in advance for any help.

 

the car would definitely run rich if you didn't have some type of fuel management for it aka. AFC/E-manage etc. by adding those fuel mods, you will be safer just as long the air your drawing in is supplemental to the fuel that you deliver if not you'll detonate your *** off. (more air = more fuel & more fuel + no air= stupid slow) you'll **** and stumble if nothing is done to compensate all the extra fuel. hope that helps you out, if not be a little more specific. a fuel pressure regulator will help too while your at it.