Postby kula » Tue Feb 26, 2008 10:38 pm
wow, some interesting comments here.
personally, I would never run a foam filter.
their filtration is just crap.
pipercross are the only ones which id consider, but they arent exactly foam.
K&N are the best for good reason, they filter very well, and flow well too.
no after market (that I've seen) filter filters as well as an OEM paper element.
so if you are worried about filtration, stick with paper.
K&N are cotton, and I've never heard to turbos sucking dust through the gauze.. I've seen them used on 1000kw+ cars with success.
Many aftermarket filters do use some oil, so they can affect some hot wire airflow meters. if you have an NA with a vane meter, theres no way it will affect it.
Unifilter filters are generally very oily, more so than K&N.