Experiences with K&N Drop in Filters? - BMW M5 Forum and M6 Forums
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post #1 of 22 Old 24th June 2008, 07:56 PM Thread Starter
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Experiences with K&N Drop in Filters?

How many people have em? Anyone have any trouble with them?

I never heard of BMC until I started doing some searches.

I installed the K&N a few weeks ago and so far no trouble.

I just want to know if I should put back the stock filters or leave in the K&N.

The BMC are bit expensive for filters. So I am not going that route.
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post #2 of 22 Old 24th June 2008, 08:05 PM
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Well it is obvious by your post you dont want to pay for the best, so leave your K&N filters in.

"Motion does not equal progress"...Cos
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post #3 of 22 Old 24th June 2008, 08:09 PM Thread Starter
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???

What makes them better? Just price???

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Well it is obvious by your post you dont want to pay for the best, so leave your K&N filters in.
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post #4 of 22 Old 24th June 2008, 08:12 PM
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No, the fit and finish of the filters are worlds apart. The K&N's just do not fit as well and the materials used by BMC are second to none.

If you compare a K&N and BMC side by side you will say to yourself...."Oh, now I see".

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post #5 of 22 Old 24th June 2008, 08:33 PM Thread Starter
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Dyno #s?

Anyone Dyno both systems?


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Originally Posted by Cosmos View Post
No, the fit and finish of the filters are worlds apart. The K&N's just do not fit as well and the materials used by BMC are second to none.

If you compare a K&N and BMC side by side you will say to yourself...."Oh, now I see".
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post #6 of 22 Old 24th June 2008, 08:47 PM
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call RPI

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post #7 of 22 Old 24th June 2008, 10:35 PM
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Quote:
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call RPI
+1

And order their scoop and filter package. They have seven sets available as we type!

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post #8 of 22 Old 24th June 2008, 10:47 PM Thread Starter
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Got it already

I have the scoop but haven't installed it yet.

I was planning on keeping the K&N with the Scoop.

But I read a lot of negative comments about the K&N so that got me thinking.

But overall they are both "oiled" filters and I bet they both perform the same.

I will shoot RPI a PM to see what his thoughts on the K&N are.



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+1

And order their scoop and filter package. They have seven sets available as we type!
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post #9 of 22 Old 24th June 2008, 10:56 PM
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Quote:
Originally Posted by M5@NYC View Post
I have the scoop but haven't installed it yet.

I was planning on keeping the K&N with the Scoop.

But I read a lot of negative comments about the K&N so that got me thinking.

But overall they are both "oiled" filters and I bet they both perform the same.

I will shoot RPI a PM to see what his thoughts on the K&N are.
Eloy's recommendation will be to use the BMC filters in conjunction with the scoops. We discussed this issue ad nauseum and there is significant justification for the choice of one over the other.

Good luck! &

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post #10 of 22 Old 24th June 2008, 10:57 PM
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This is from Gabe (NobelM400) at RPI:

"The scoops work with the K&N Typhoon or the BMC. However, the BMC is a better system, IMHO. You lose HP with the K&N because it sucks up all of the hot air from the engine compartment. The scoops help you regain the lost HP, but the net HP gain is smaller than if you go with the scoops & BMC. The K&N does give a more aggressive sounding induction noise though."

I replaced my K&N typhoon w/ the BMC. The K&N just isn't designed well for the M5. Also it's visibly clear that the BMC is a much higher quality filter. The K&N does sound more aggressive, however.

Scoops and the BMC filters FTW.
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