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Old 01-14-2002, 09:16 AM   #1
tcmo
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Member#: 12817
Join Date: Nov 2001
Vehicle:
2013 Legacy 2.5i LTD

Default 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.
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Old 01-14-2002, 09:27 AM   #2
Keith99RS
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Chapter/Region: NESIC
Location: Suffield, CT
Vehicle:
05 Nissan Titan
06 B9 (hers)

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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.
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Old 01-14-2002, 01:07 PM   #3
Robin2
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Location: Ottawa, Ontario, Canada
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2011 WRX sedan
Plasma Blue

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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
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Old 01-14-2002, 01:51 PM   #4
matts2.5rs
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2004 GTO
Torrid Red

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This is what my setup looks like.
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Old 01-14-2002, 05:50 PM   #5
Surboo
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Location: Colorado Springs, CO
Vehicle:
1999 2.5 RS
Rally Blue

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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
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Old 01-14-2002, 05:57 PM   #6
matts2.5rs
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Torrid Red

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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.
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Old 01-14-2002, 10:08 PM   #7
Peaty
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2010 Legacy 3.6R Lim
Azurite Blue Pearl

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Here is what I did:

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Old 01-15-2002, 09:10 AM   #8
wilddave1
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Aprilia Tuono

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Hey Peaty, that is the exact setup i have been thinking about. Were did you get the pipe and connectors.
Thanks,
Dave
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Old 01-15-2002, 09:51 AM   #9
Peaty
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Azurite Blue Pearl

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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
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Old 01-15-2002, 12:45 PM   #10
wilddave1
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Aprilia Tuono

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$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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