Question on K&N filter
 

Does it help to drill a few holes on the filters cover of my 3.2? I see alot of 964 owners do it. You get a nice rumble from it too!


Please reply with any feedback.

Net hp gain=0
Net gain in cool sound=10

Cool sound with holes and filter , holes only or filter only?

Cool sound with holes and filter.
I drilled mine but first I picked up an extra cover from a salvage yard so that the one that came with my car was untouched. Just in case I did not like it or I really messed up.

About a year ago, I put a K&N setup on my wife's Saab (with the Viggen engine option). The turbo defintely spools up a little quicker and I can hear a pretty turbo "whistle" on full boost with the supposedly less restrictive filter. I don't drive her car that often, but she said that it made a nice difference. However, with what I've read on this board recently regarding the cons of the K&N, I'm entertaining thoughts of going back to the stock filter on her car.
Steve

Some folks love K&N, others say it lets in more dirt (greater engine wear and need for oil changes more often). The only thing I know for sure is that you HAVE to keep a K&N regularly cleaned and recharged with a special oil or it will let in a lot of dirt into the motor. You can cut holes in the air box to get more whoshing sound (cool) but the trade off is you may be letting in more warm air (lowers hp). I recently bought a second stock box cover to cut some holes in (yes, I like the sound). You don't have to have a K&N to do that. One final thought, your intake is going to be limited to your throttle body and exhaust. If those are stock, then the increase intake ability will have no effect because the air can't go in any faster than it can exit the other side.

Don't waste your money on a k&n, If you want one come and get it, you can have the one that I bought before I knew any better. Jim Portola hills

#37 from Dr. Pate's "101 Tips for 911 Owners"


37. Don’t waste your time with K&N air filters.

Too late - Installed - Lesson learned!

Did you buy the recharge kit? If not, don't use it more than the reccomended amount of time without it.

There's lots of debate on this if you search. One of my customers in the U.K. actually emailed RUF about this and this was their response:



How interesting...

RUF are acknowledged masters of their craft. I wonder if this tip works ? (and on which 911's)

I feel that it could well be trusted information, because when I drilled zillions of holes in my airbox, if definitely felt weaker in the intermediate range. I then progressively blocked of some of the holes, until it "felt" back to normal. ...This is of course entirely unscientific.

I will probe them further.

THANKS

Steve

Steve Darnell
Club Sport Register
Porsche Club Great Britain
T: +44 (0)1933 358430
E: steve.darnell@virgin.net
M: +44(0) 7885 082817


-----Original Message-----
From: Ruf Automobile [mailto:info@ruf-automobile.de]
Sent: 05 March 2004 07:49
To: steve.darnell@virgin.net
Subject: Airbox


Dear Mr. Darnell,

Thank you very much for your email. We also try a few solution for the intake system but we never do a dyno test. For road cars we put in K&N or BMC filters and drill in the bottom of the original cover 5 holes with 25mm diameter. This feel better throttle response a free rev up with loosing no midrange torque.

If you have any question, please do not hesitate to contact us.

Best regards

H.-P. Lieb
RUF Automobile GmbH



Ruf Automobile GmbH Mindelheimer Str. 21 87772 Pfaffenhausen
Tel: 0049 (0) 8265 - 911911 Fax: 0049 (0) 8265 - 1213 info@ruf-automobile.de

Hmmmm. The drilled the holes in "the bottom of the cover.." I wonder if that has something to do with warm air???

you are not really listening to folks. you need to read some past discussions on K&N and decide if it is the right thing. you dont want to risk your new car. that would be the lessoned learned.

cliff

What Cliff said