second air filter in MY 99

tcmo · 01-14-2002, 09:16 AM

What are the advantages/disadvantages in removing the 2nd air filter at the throttle body? I know I can purchase the gasket but can not find the cost of the filter itself or if it even needs to be replaced-the handbook does not mention this filter at all. Thanks. I did a search but found 1 hit that did not address my questions. Thanks.

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Keith99RS · 01-14-2002, 09:27 AM

I have replaced my fender filter with a K&N and used the gasket for the second airbox ,as have many people in this club, and have had no problems. It may not be a huge performance booster, but it has to help out some. According to the owners manual there should only be a fender filter in non California cars, but a lot of 99's have both filters. Go figure.

I'd pick up the gasket and a K&N if you don't plan on going for a CAI. For about $80 or $90 you will have a practically cost free airfilter set up and never need to buy another airfilter as long as you own the car. Just clean the K&N every once in awhile and be careful not to over oil it.

Robin2 · 01-14-2002, 01:07 PM

Yup..... same here...... When I took out the 2nd filter, it looked new..... (at 30k miles on the car)....

It basicly restricts it further..... a mild gain but nothing to lose...

I have a MRT foam filter myself.....

Robin

matts2.5rs · 01-14-2002, 01:51 PM

This is what my setup looks like.

Surboo · 01-14-2002, 05:50 PM

Wow! That last setup looks really nice. I like the RBP J-tube. I was actually thinking about how I could do something like that just last night. How does the performance and sound compare with using just a cone filter on the J-tube? I am running a Minnam intake right now with a K&N cone, performs good but it is a bit loud for me. Thanks
-Brandon

matts2.5rs · 01-14-2002, 05:57 PM

I was running a Weapon-R Dragon intake and it was alittle to loud for me so I took the filter off and just put the stock box back in. It is a lot quiter and it has about the same performance. The j-tube is from the Weapon-R intake and the rubber hose between the MAF and the tube is a 3" truck water hose that I got from Salvo's Auto Parts.

Peaty · 01-14-2002, 10:08 PM

Here is what I did:

wilddave1 · 01-15-2002, 09:10 AM

Hey Peaty, that is the exact setup i have been thinking about. Were did you get the pipe and connectors.
Thanks,
Dave

Peaty · 01-15-2002, 09:51 AM

I did this a while ago, there may be better places t get the parts now, but at the time this link will show you where I got the stuff. Some other info too: (the very bottom of that page shows the pic above, I had a ractive filter but was nervous about my 99 maf going south although I never did have a problem in over 20K miles)

http://www.scoobymods.com/forums/sho...p?threadid=179

wilddave1 · 01-15-2002, 12:45 PM

$85 us seems pretty high for just a 45 mandrel and couplings. Thanks for the info. I have been thinking about this for a while. I already put in the gasket and I have an Amsoil filter.

Thanks Again Peaty,

Dave

PS: Hey guys check out auto-jet.com. I just ordered a 3" mandrel 45 for $20. They said they could do stainless for $50. And will ship anywhere. They told me 2 weeks tops. I think I can get the couplings locally. Just an Idea.

also ask for John

01-14-2002, 09:16 AM	#1
tcmo Scooby Newbie Member#: 12817 Join Date: Nov 2001 Vehicle: 1999 Forester L	second air filter in MY 99 What are the advantages/disadvantages in removing the 2nd air filter at the throttle body? I know I can purchase the gasket but can not find the cost of the filter itself or if it even needs to be replaced-the handbook does not mention this filter at all. Thanks. I did a search but found 1 hit that did not address my questions. Thanks. * Registered users of the site do not see these ads.

01-15-2002, 12:45 PM	#10
wilddave1 Scooby Specialist Member#: 9101 Join Date: Aug 2001 Chapter/Region: South East Location: Hickory, NC Vehicle: 2005 Jeep Wrangler Aprilia Tuono	$85 us seems pretty high for just a 45 mandrel and couplings. Thanks for the info. I have been thinking about this for a while. I already put in the gasket and I have an Amsoil filter. Thanks Again Peaty, Dave PS: Hey guys check out auto-jet.com. I just ordered a 3" mandrel 45 for $20. They said they could do stainless for $50. And will ship anywhere. They told me 2 weeks tops. I think I can get the couplings locally. Just an Idea. also ask for John Last edited by wilddave1; 01-15-2002 at 01:02 PM.

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01-14-2002, 09:27 AM	#2
Keith99RS Scooby Specialist Member#: 9243 Join Date: Aug 2001 Chapter/Region: NESIC Location: Suffield, CT Vehicle: 05 Nissan Titan 06 B9 (hers)	I have replaced my fender filter with a K&N and used the gasket for the second airbox ,as have many people in this club, and have had no problems. It may not be a huge performance booster, but it has to help out some. According to the owners manual there should only be a fender filter in non California cars, but a lot of 99's have both filters. Go figure. I'd pick up the gasket and a K&N if you don't plan on going for a CAI. For about $80 or $90 you will have a practically cost free airfilter set up and never need to buy another airfilter as long as you own the car. Just clean the K&N every once in awhile and be careful not to over oil it.

01-14-2002, 01:07 PM	#3
Robin2 NASIOC Supporter Member#: 390 Join Date: Oct 1999 Chapter/Region: E. Canada Location: Ottawa, Ontario, Canada Vehicle: 2011 WRX sedan Plasma Blue	Yup..... same here...... When I took out the 2nd filter, it looked new..... (at 30k miles on the car).... It basicly restricts it further..... a mild gain but nothing to lose... I have a MRT foam filter myself..... Robin

01-14-2002, 01:51 PM	#4
matts2.5rs Scooby Newbie Member#: 7067 Join Date: May 2001 Location: Baltimore, MD, USA Vehicle: 2004 GTO Torrid Red	This is what my setup looks like.

01-14-2002, 05:50 PM	#5
Surboo Scooby Newbie Member#: 8721 Join Date: Jul 2001 Location: Colorado Springs, CO Vehicle: 1999 2.5 RS Rally Blue	Wow! That last setup looks really nice. I like the RBP J-tube. I was actually thinking about how I could do something like that just last night. How does the performance and sound compare with using just a cone filter on the J-tube? I am running a Minnam intake right now with a K&N cone, performs good but it is a bit loud for me. Thanks -Brandon

01-14-2002, 05:57 PM	#6
matts2.5rs Scooby Newbie Member#: 7067 Join Date: May 2001 Location: Baltimore, MD, USA Vehicle: 2004 GTO Torrid Red	I was running a Weapon-R Dragon intake and it was alittle to loud for me so I took the filter off and just put the stock box back in. It is a lot quiter and it has about the same performance. The j-tube is from the Weapon-R intake and the rubber hose between the MAF and the tube is a 3" truck water hose that I got from Salvo's Auto Parts.

01-14-2002, 10:08 PM	#7
Peaty Techno Sapien Moderator Member#: 449 Join Date: Oct 1999 Chapter/Region: MWSOC Location: Lawrence, KS Vehicle: 2010 Legacy 3.6R Lim Azurite Blue Pearl	Here is what I did:

01-15-2002, 09:10 AM	#8
wilddave1 Scooby Specialist Member#: 9101 Join Date: Aug 2001 Chapter/Region: South East Location: Hickory, NC Vehicle: 2005 Jeep Wrangler Aprilia Tuono	Hey Peaty, that is the exact setup i have been thinking about. Were did you get the pipe and connectors. Thanks, Dave

01-15-2002, 09:51 AM	#9
Peaty Techno Sapien Moderator Member#: 449 Join Date: Oct 1999 Chapter/Region: MWSOC Location: Lawrence, KS Vehicle: 2010 Legacy 3.6R Lim Azurite Blue Pearl	I did this a while ago, there may be better places t get the parts now, but at the time this link will show you where I got the stuff. Some other info too: (the very bottom of that page shows the pic above, I had a ractive filter but was nervous about my 99 maf going south although I never did have a problem in over 20K miles) http://www.scoobymods.com/forums/sho...p?threadid=179