Air sucked in from under the right front wheelarch, not from the engine bay. I have, since october 2001 such a k&n filter (just the replacement type of the stock, put in the standard airbox) a couple of weeks after I put it in my maf was gone, now when I clean the filter the oiling afterwards is almost zero and since no problems anymore. But for performance as such I guess it's not doing much. The same story for the chipping I did, also back in october 2001, in theory you consume less fuel if you keep the same performance as before, but if you use the extra power the fuel consumption goes up as well, so my guess is that my consumption of fuel is still the same as before the chipping but I have a largely enjoyed extra power available now, both the engine and the autobox do enjoy the extrapower, looks as they were made for it but got strangled by LR.