Quote:
Originally Posted by Rom3n
We have also tested the open filter intakes on our 335 and found that with the hood closed or open the car loses power the more we ran it on the dyno. The stock air box on BMW's is actually very good.
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Yep. The key to making more power with the intake is to get more air into the stock intake system. Even then, you have to worry about air turbulance.
This whole hot air intake discussion has been talked about on the m5board and e60.net. No one on those sites buys them but I guess this forum might be a little behind.