Originally Posted by Tony v
wondering if anybody in cali have done it and no problems with smog ?
Bump! Is there also any benefit to simply replacing the oem charcoal filter with another type of filter (ie. the same paper filter used for the air filter?)
So instead of having no charcoal filter and only a k&n air filter, how about a paper charcoal filter and a k&n air filter?
I'm assuming that BMW used that specific type of charcoal filter to begin with as maybe a paper filter won't catch the excess vapors...