Cabin filter paper is very easy to improvise. Like you've said, just some filter paper, cut to side, and mounting tapes will do the trick. Material wont cost more than 10 bucks. And you can do one in less than 30mins.
Could the issue be sealing at the edges?
SPQR The first ever Whiteline RSB pattern for CL9 Euro. The world first ever after market RSB for RE4 CRV.
Originally Posted by MiSloVic
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