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hi, i have a zen mpfi and m running it for about a month without an airfilter. i have used a pvc pipe and feeding the engine with cold air from outside the car. the result: definately: an increase in pickup of the car in mid/higher revs and good sound and most likely i am getting better fuel economy. now, what kind of complications i can have?? will it be like sort of cleaning up stuffs...like the trottle body and the engine oil etc or can be major mechanical failures?? is there any possibility of engine ceaseup?? please help, thank you. from zuber.