So I have ordered parts to make my own CAI and have been doing research an ddont know if it was smart to order. I see a lot of places that CAI's can decrease gas mileage because more dense air = more fuel to the engine to keep the fuel to air ratio constant. Others have said it will increase gas mileage because you will get better output at lower rpms. Also, does a CAI in the winter give you worse gas mileage than a stock setup in the winter? I dont know which to believe. Please help