07-04-2015, 02:46 AM
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#1
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Registered User
Join Date: Jun 2015
Location: Scotland
Posts: 21
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K&N filter
If i place my excising standard air filter element with a K&N filter element, will this effect my MAS sensor in any way, if not will the K&N filter better my performance on my Porsche Boxster 986.
Any experience would be grateful appreciated.
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07-04-2015, 05:03 AM
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#2
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Registered User
Join Date: Dec 2014
Location: Pacific Grove, CA
Posts: 494
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If you use the "search" feature, for this topic, you will find out more fact, fiction, lies and opinions than you will ever want to know. 
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07-04-2015, 08:39 AM
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#3
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Registered User
Join Date: Aug 2009
Posts: 1,466
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If your sensible and blow out the excess oil before installing and are able to clean it regularly you should be OK. I ran two different style with out any issues for 20+K. In the end I'm back using a stock filter because replacing them is easier than cleaning the K&N every couple thousand miles.
Threads read about a 50/50 split of those how contribute a problem to running one and those how have had reasonable luck running one. The other thing you'll find is allot of negative comments from people who have never used one??
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2003 Black 986. modified for Advanced level HPDE and open track days.
* 3.6L LN block, 06 heads, Carrillo H rods, IDP with 987 intake, Oil mods, LN IMS. * Spec II Clutch, 3.2L S Spec P-P FW. * D2 shocks, GT3 arms & and links, Spacers front and rear * Weight reduced, No carpet, AC deleted, Remote PS pump, PS pump deleted. Recaro Pole position seats, Brey crouse ext. 5 point harness, NHP sport exhaust
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07-04-2015, 08:42 AM
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#4
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Registered User
Join Date: Oct 2014
Location: Santa Rosa, CA
Posts: 520
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Quote:
Originally Posted by jsceash
If your sensible and blow out the excess oil before installing and are able to clean it regularly you should be OK. I ran two different style with out any issues for 20+K. In the end I'm back using a stock filter because replacing them is easier than cleaning the K&N every couple thousand miles.
Threads read about a 50/50 split of those how contribute a problem to running one and those how have had reasonable luck running one. The other thing you'll find is allot of negative comments from people who have never used one??
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K&N filters have to be cleaned every 2000 miles? 
I thought cleaning them at every oil change is good enough, am I wrong?
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2003 2.7 Boxster - Tiptronic - Carrera wheels - OBC - Red calipers - Cat pipes - Modified muffler - Rear speakers - K&N - Litronics
2006 V6 Mustang
2008 ML 350
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07-04-2015, 09:42 AM
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#5
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Track rat
Join Date: Nov 2006
Location: Southern ID
Posts: 3,701
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Quote:
Originally Posted by EJ-Fresno
K&N filters have to be cleaned every 2000 miles?
I thought cleaning them at every oil change is good enough, am I wrong? |
How much dust and dirt do you drive through? More dust = clean more often.
I used K&N in offroad motorsport for 20 years and liked them in that application. I just don't see much upside with these cars yet there are a lot of downsides. I prefer a stock filter for 986/987 cars.
__________________
2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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07-04-2015, 01:50 PM
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#6
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Registered User
Join Date: Dec 2012
Location: Jackson Hole, Wyoming
Posts: 800
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Quote:
Originally Posted by ssmart
If i place my excising standard air filter element
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You don't have to cut it out ("excise")  .
K&N filters flow more air, so they don't filter as well as stock air filters, unless you oil them up too much, which then allows oil to be sucked into the engine. Stock filters are cheap. I'd stick with them.
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07-04-2015, 02:20 PM
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#7
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Registered User
Join Date: Jan 2014
Location: Albuquerque, NM, USA
Posts: 746
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There was a test of BMW K motorcycles measuring airflow past filter. Compared were
Stock filter
Stock filter 1/2 blocked off
No filter
K&N
There was no measured significant difference in airflow.
Waste of money, and if you need one that's rectangular as opposed to circular, a poor quality product.
__________________
Kent Christensen
Albuquerque
2001 Boxster
2007 GL320 CDI, 2010 CL550
2 BMW motorcycles
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07-04-2015, 02:41 PM
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#8
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I am my own mechanic....
Join Date: Feb 2013
Location: Salt Lake City, UT
Posts: 3,432
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You're better off fitting a 987 filter box and filter. That's what the SE came with. Took me a couple filter swaps before some parts guy said its a 987 filter.
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'04 Boxster S 50 Jahre 550 Spyder Anniversary Special Edition, 851 of 1953, 6-sp, IMS/RMS, GT Metallic silver, cocoa brown leather SOLD to member Broken Linkage.
'08 VW Touareg T-3 wife's car
'13 F150 Super Crew long bed 4x4 w/ Ego Boost
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07-04-2015, 07:15 PM
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#9
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Registered User
Join Date: Oct 2014
Location: Santa Rosa, CA
Posts: 520
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Quote:
Originally Posted by Timco
You're better off fitting a 987 filter box and filter. That's what the SE came with. Took me a couple filter swaps before some parts guy said its a 987 filter.
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Yes, I have been looking into it but this seems too complicated for me 
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2003 2.7 Boxster - Tiptronic - Carrera wheels - OBC - Red calipers - Cat pipes - Modified muffler - Rear speakers - K&N - Litronics
2006 V6 Mustang
2008 ML 350
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07-05-2015, 08:35 AM
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#10
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Registered User
Join Date: Dec 2012
Location: DE
Posts: 126
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Quote:
Originally Posted by lkchris
There was a test of BMW K motorcycles measuring airflow past filter. Compared were
Stock filter
Stock filter 1/2 blocked off
No filter
K&N
There was no measured significant difference in airflow.
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How valid a test is this if it finds no difference in flow between a half blocked stock filter and no filter at all?
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07-05-2015, 09:07 AM
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#11
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I am my own mechanic....
Join Date: Feb 2013
Location: Salt Lake City, UT
Posts: 3,432
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Quote:
Originally Posted by spendy
How valid a test is this if it finds no difference in flow between a half blocked stock filter and no filter at all?
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Performance based on available air?
Obviously airflow is blocked but the engine will only take in what it can unless blown. Test shows the car is "over-filtered", or it takes a severely blocked filter to actually take performance away. And more air flow doesn't always mean squat.
__________________
'04 Boxster S 50 Jahre 550 Spyder Anniversary Special Edition, 851 of 1953, 6-sp, IMS/RMS, GT Metallic silver, cocoa brown leather SOLD to member Broken Linkage.
'08 VW Touareg T-3 wife's car
'13 F150 Super Crew long bed 4x4 w/ Ego Boost
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07-05-2015, 09:36 AM
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#12
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Certified Boxster Addict
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,669
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Quote:
Originally Posted by Joe B
K&N filters flow more air, so they don't filter as well as stock air filters, ...
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That is exactly what this test showed: Debunking the K&N Myth - Why OEM is Better
__________________
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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07-05-2015, 12:07 PM
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#13
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Registered User
Join Date: Dec 2014
Location: Pacific Grove, CA
Posts: 494
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Told ya! 
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07-06-2015, 02:38 AM
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#14
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Registered User
Join Date: Aug 2013
Location: Ottawa, ON
Posts: 452
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I replaced mine this past Spring and never had an issue. Car sounds smoother if anything as the old paper one was clogged up really bad... no issues with MAS sensor.
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DrCactus
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07-06-2015, 04:11 AM
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#15
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Registered User
Join Date: Sep 2012
Location: S. New Jersey
Posts: 1,239
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Car came with one. I thought that was a good indication the PO thought about his/her car to think about doing something other than just drive it.
I used it no problems for 1-1/2 years. I had put one in my mustang and drove it 80k miles with no issues
Before a 2500+ mile road trip last year, I thought I didn't want the added variable of an over oiled Filter potentially clogging my MAF so I put in paper.
I'm getting ready for another 2000 mile road trip and I'm going to put in another new paper
Only issue with paper filter, I can't find any in-stock in auto parts stores around me so it's another basic maintenance item I have to order on-line
__________________
2002 S - old school third pedal
Seal Grey
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07-06-2015, 11:46 AM
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#16
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Registered User
Join Date: Jun 2013
Location: Nanaimo, Vancouver Island, British Columbia, Canada
Posts: 906
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How are the fab speed ones?
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Mena
Boxster
Lil Red
2009 Porsche Cayman 2.9L
Name my car - no
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