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Old 06-26-2006, 04:22 PM   #1
flacoy2k
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K&N filter claims 18.63HP gain on E46 M3 dyno graph shown.

I can not believe that K&N has made an intake system for the E46 M3 that will increase HP by 18.63HP. Do any fanatics has tried this product?

Here is the dyno graph they published.

http://www.kandn.com/dynocharts/63-1115.pdf

Here is their product description.

http://www.knfilters.com/search/prod...x?Prod=63-1115
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Old 06-26-2006, 04:33 PM   #2
white46
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most of dynos provided by its own makers are
mine(63-1113) claims to be 9.7hp increase but i don't think it's nowhere near 9.7hp.
hopefully 5hp at max.
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Last edited by white46; 06-26-2006 at 04:37 PM.
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Old 06-26-2006, 04:34 PM   #3
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If you look in the M3 Forum here on Fanatics, you will find actual dynos of various intakes. GL.
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Old 06-26-2006, 05:00 PM   #4
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I recently tried the K&N on my stock M3 with an Eisenmann exhaust.

The first thing I noticed was it sounded throatier, especially in the midrange. The power seemed to be about the same. As the car warmed up, and I spent more time idling at stop lights, I started to notice some surging and rouger running. As the engine reached full temperature, and more time was spent at red lights, I started to feel as though I was actually DOWN on power.

None of my feeling about HP gains or losses were documented or dyno'd, but I do have to say that if there was a performance gain, it was outweighed by the drivability loss.

Needless to say, I returned it, and without too much duress, received my money back.

On a final note, when I took out the stock air cleaner I noticed how beatifully engineered it was, and that it draws air from the kidneys AND from the duct beside the fog light on the driver's side, creating a (subtle) ram air effect, one that no air cleaner drawing from around the engine compartment could match.

I've heard there are better systems (Gruppe M, Dinan) but they're not a great value, and without any other mods, will cost a lot for very little increase in performance. In the case of all BMWs, it would be logical to assume that the engineers there have looked at easiest ways to get power already, and that they've experimented with countless intakes and what we have in our cars from the factory is very well sorted already.
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Old 06-26-2006, 07:35 PM   #5
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K&N's results are simple marketing tripe because horsepower pulls are performed with a cool engine compartment and a comparison with a non-moving M3 is bogus because it is in a closed environment. In typical driving conditions a stock M3 has a cool air ram air effect that I bet produces more horsepower then a K&N cone filter.
I would never buy a car that has run a K&N filter but that is another discussion.
George
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Old 06-26-2006, 10:20 PM   #6
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The Porsche Club of America dyno-tested K&N filters in a variety of new Porsches in 2001 and found no power increase whatsoever.
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Old 06-27-2006, 09:00 AM   #7
flacoy2k
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So it would be better to just buy a replacement filter element and forget about a cone filter.

This is K&N replacement filter element.

http://www.knfilters.com/search/prod...x?Prod=33-2231
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