Originally Posted by Ender.
When we installed the injen intake on a friends evo it ran perfectly fine. I guess its just on a car to car basis.
Put the stock intake back on and see what happens.
Bingo. Kind of like DSMs running open/recirculated BOV's. Some cars can get away with it, others totally stall out. I too thought at first that an open element filter could NOT cause the problem, but considering how finicky the OBD systems are now a days, I could see it happening.
Hell, cars in our present day, will throw a CEL over a filled charcoal canister.
