That all sounds very technical! Thanks for the advice though. You say your running a K&N panel filter. Do you notice much of a change to performance/responsiveness/mpg or do you just save the cash by not having to change the filter ever?
it was a slight difference when i put mine in, but nothing remarkable. it revs a bit easier after 4000rpm, i think. no special sounds, though. but it does make a slight difference. i raced a 530i on 1/4m with my stock air filter and he won (just) 3/3. then replaced the stock filter with K&N one, and i won (just) 3/3. so it does improve a bit the performances, but not dramatically.
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