Don't Do This!! I sucked a bird in thru my grill, and it went straight though the flimsy filter, past where my charcoal filter used to be, and into my engine. BMW voided my warranty for everything except the power seats now, and I have a 12k repair bill.
:P
LOL!!! This thread has gotten hilarious.
btw, there is better throttle response. I find it funny the people who have no experience in doing this exact modification are the experts. "Well on paper".... blah blah blah...
Oh.. one more thing. I just took a 400 mile trip up to Vermont (which I've done a few times in the past in this car). I got 31mpg average. I ususually get 28.5 or so. I don't know if this mod helped in that figure (I certainly didnt baby the car any more), but I would think it is a likely contributor.