That's a small speed bump for the hot air, not a heatshield.
But you're still not getting air in there...
Argh, never mind. You've never seen an E30 in a wind tunnel and I can't find my pictures of such to explain it to you. Bottom line, your filter is in a low pressure zone and all it's doing is sucking heat from the radiator, not from the headlight. If you piped it up from the brake duct you'd be getting somewhere.
But you're still not getting air in there...
Argh, never mind. You've never seen an E30 in a wind tunnel and I can't find my pictures of such to explain it to you. Bottom line, your filter is in a low pressure zone and all it's doing is sucking heat from the radiator, not from the headlight. If you piped it up from the brake duct you'd be getting somewhere.



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