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« on: September 29, 2006, 10:03:27 AM »
Update on this. Below is a reply I recieved about this on another message board. This helped confirm why I think this might be a good idea. I'm still not having any luck tracking down an airbox. It looks like any of the E36 M42 boxes would work. Anybody got one lying around or know of a source? Incidentally, there's something interesting in the realoem.com parts diagram for the 1991 318i. They call the airbox assembly an "intake muffler" and they show two part numbers. One is simply "intake muffler" and the other is "intake muffler with cyclon". What's that all about?
Just a quick question for those of you who know about these things. With all other things staying the same, will an increase in the size of the airfilter result in better airflow to the engine.
Maybe. :-) What's important is the amount of air pressure decrease as the air goes through the filter. Less pressure drop = more airflow (at full throttle). Assuming filters of similar construction, a
larger filter should produce less pressure drop, and therefore, more airflow.