BMW E87 118D air filter upgrade
thingiverse
I designed this air filter upgrade for my BMW E87 118D, and a couple of people asked for the files personally, so I figured that I'd just upload the files here. Since there is a cold air intake in the bottom of the standard air box, the filter should be exposed to mostly fresh air, only sucking in a minimal amount of warm air from inside the engine bay through the top of the air filter. After upgrading I've noticed a notable improvement in throttle response and a slight increase in power in the higher revs.
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