Not sure about the bimmer, but I know that on some of the GM cars I have
owned the "cold air" performance filter had advantages and disadvantages.
It did seem to improve performance, but only at the very top end. It also
made the car louder. A lot louder. So much so that with a stock exhaust,
the intake was louder than the exhaust at idle and it just roared at full
throttle. The lack of a proper filter box also made the car susceptible to
splashes in the very wet. So bad that running through a puddle killed the
motor on one occasion. The filter got so wet I had to dry it out to get
the car running again. For my situation, the performance filter in the
special "cold air intake kit" was not worth the tradeoffs. I DO run a K&N
filter in the stock box on several of my vehicles, and have been happy with
them, but I have not notice any measurable gain in performance. I just
prefer to be able to clean and service my air filters.
On Wed, Nov 5, 2014 at 6:13 PM, Jim Stone <1789alpine@gmail.com> wrote:
> I have been watching old episodes of Wheeler Dealers lately and the last
> two I
> saw were about an MX-5/Miata and BMW 3 Series. In both cases, one of the
> first things Edd did was replace the stock air cleaner assembly with a
> performance air filter. According to Edd, it is all good: increased
> horsepower, better sound, etc. However, I have to believe that the
> contraption he is replacing (filter box, filter, hoses, etc.) costs the
> manufacturers more than than performance filters would. If the KN options
> (I
> think that is what Edd is using) are so good and increase horsepower, why
> wouldn t the manufacturers - particularly BMW - put them in to begin with?
>
> Just curious. And thinking about my 2000 3-Series.
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