How do I give my bmw 318i e46 (Automatic) more power as cheap as possible???
The basic theory about getting more power out of your engine is to increase the amount of air coming in and increase the amount of air going out. If you can find a way to do this cheaply on a BMW, then more power to you. Increasing the amount of air going in: Generally, the blockage point for this is your air intake box. If you can switch this out to a cold air intake, it would increase the amount of air coming in since 1) the current air box opening is smaller than a 3″ diameter CAI, 2) the upgraded air filter allows for more air to come in, and 3) delivering cold air into your engine vs warmer air has a higher concentration of oxygen molecules (air is more dense) which provides a bigger combustion in your engine, thus more power. More air going out: Even if you can get more air going in, much of this power can be dampened by not getting the dirty air going out fast enough. The stumbling block here is your exhaust system. If you ever wondered why some of those ricers are so dam loud,
