rpi cold air or k&n cold air kit? - BMW M5 Forum and M6 Forums
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post #1 of 57 Old 7th November 2007, 05:02 AM Thread Starter
timucin
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rpi cold air or k&n cold air kit?

heard some maf problems with k&n system
which one would you prefer? hp gain?
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post #2 of 57 Old 7th November 2007, 05:04 AM
unfoundhorsepower
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did you try a search ??? Not sure about the RPI system...

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post #3 of 57 Old 7th November 2007, 05:14 AM
NobleM400
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There are advantages to each, so be sure to familiarize yourself with them before you decide. No system will be perfect for every user.

Here's a basic rundown though:

K&N: Better induction noise (I personally like the sound of the open element, especially on this V10). HP gain for those who do not drive with a hood installed. Higher cost.

RPI: No change in sound, more power with a hood.

I'm sure others will chime in as well.
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post #4 of 57 Old 7th November 2007, 05:17 AM
keang24
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Here is the thread on RPI scoop. It might be too overwhelm with all baller's comments, but so far all the cars tested with hp gain (non report loss or no gain)

RPi Ram Air Intake Now Available.
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post #5 of 57 Old 7th November 2007, 05:38 AM
///Marshall
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The RPI scoops should be able to co-exist with the
K&N Typhoon. The scoops are there to "ram" more
into the intakes through the front grill.

I believe RPi ran some tests on Brav's car and found that
the scoops help flush the hot air away from the K&N's. If
memory serves I believe that was the original intent of the
RPi scoops. Take a look at this thread, post 22 in particular:

Installed M5 K&N Typhoon on my M6 tonight

NobleM400, you think the M5/M6 would look good sans hood? Might sound pretty mean!

Last edited by ///Marshall; 7th November 2007 at 05:40 AM.
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post #6 of 57 Old 7th November 2007, 05:46 AM Thread Starter
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did anybody saw 'Service Engine Soon light' with bmc filters coming with rpi ram system?
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post #7 of 57 Old 7th November 2007, 05:57 AM
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Take a look at keang24's link. On page 532 (i.e. 10 or 11)
member extassy seems to have run into limp mode at 130mph.
It seems like he was the only person who had this problem so
it was unclear whether if the ECU was freaking out due to too
much air or it was just coincidence. Others have ran this fast
and haven't had problems.

I personally haven't had any problems.

Last edited by ///Marshall; 7th November 2007 at 05:58 AM.
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post #8 of 57 Old 7th November 2007, 12:24 PM Thread Starter
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post #9 of 57 Old 7th November 2007, 03:09 PM
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I am also pondering on the K&N typhoon and on the RPI system.

I think I will prefer the sound because that is more tangible. Minimal horsepower gain will not be felt or much appreciated except on paper.

And it also looks nice when the hood is popped. So +2 now for K&N.

Does it make sense to add the RPI Scoop to the K&N typhoon and is this the best combo?

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I am really annoyed every time I open my hood to worship my beast's manly organs.

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post #10 of 57 Old 7th November 2007, 03:17 PM
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I have the RPI Scoops/BMC filters combo and am very happy with it. I have had not thrown any faults - even when my car was driven (by somebody else of course) at 13.0+ mph.

Keep in mind that Extassy has many many other mods that might be a contributiing factor to the reduced power fault he received.

If how your car looks with the hood open is more important to you than performance, get the K+Ns. Keep in mind that at least a few members have pulled the typhoons b/c they got sick of throwing faults.

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