Quote:
Originally Posted by arcosine
Maybe you misunderstand my comment. Rock wool is dusty and will get into the air filter and clog it. Rock wool not good, they use air blowers to put it in the attic, imagine it blowing around the engine compartment. :P
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My engine at least takes air outside of engine bay (diy ram air, turbo diesel), can't see how it could go against wind to ahead of car to be able to enter to filter. Might not work with everyone, also there might be bit different kind of rockwools too, ones I have here I can lift from other end as it is quite stiff stuff.