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03 CTS
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Discussion Starter #1
You mentioned that the K&N adds about 8 rwhp but that was with the hood open. With the hood closed what would be the hp loss, would it then be equal to the volant? Adding about 6 RWHP??
 

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2003 CTS Manual Trans., '93 STS
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3,035 Posts
I honestly don't know. If the thing sucks nothing but hot air under the hood, then the loss would be more than that, and I wouldn't be surprised if it equaled the stock airbox. If one were to open the flap next to the radiator for cold air, just like when installing a Volant, then fabricate a small 2" high block off plate for the rear of the filter (it only comes with an inside block-off panel, facing towards the engine), it would flow just as well as with the hood open.

I have to say that I was not only impressed by the K&N filter size (it has 60 - 5.5" wide pleats, compared to 54 - 4.375" wide pleats on the Volant, and 24 - 5.5" wide pleats for the AirHog), but the velocity stack shaped intake transition from the huge filter to the MAF was very nice. It also includes a hard intake tube to replace the stock accordian rubber one. It's a very nice setup, just loud. I looked into adapting it into the Volant and a modified (gutted) stock airbox. There is just no way to fit that big filter in there. The MAF adapter is also too large for the filter with the Volant.

K&N only misses the boat in not enclosing their FIPK in an airbox for noise. Most people get sick of the noise after a short while, and remove them.
 
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