got a chance for a great deal on a mopar ECU. From what i understand you just have to swap out the stock ECU with the mopar one without worries on changing sensors or wiring harness. Now i know this is hard but with u neon buffs out there maybe you can help me out. I know its not much but with my college budget and handy work this is what i got:
obx 4-1 header
dynamax muffler (stock cat)
iceman intake(straight down in front of battery)
racing pulleys
9.3mm wires with bosch +4 plugs
and since i did a recent engine swap (rod blew outa my old one) everythings been cleaned out fuel injectors, tubes, fuel rails, the works. even though it doesnt help with my question also added bigger clutch (additiontal 2") new flywheel and bearing.

what kinda boost in HP you think im gonna get? right now im getting 25mpg city and 31 mpg highway what do you think this is gonna do to my mpg after mopar ECU?
thanks for the help

 

Lose the Bosch +4 plugs and put in stock Champion plugs.

The MPG depends on your driving habits, you may find yourself pushing on the gas more with the added HP. Some people have reported better MPG after installing the Mopar PCM.