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Old 05-16-2000, 10:47 AM   #1
Gambit
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Join Date: Jul 1999
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Cool 2nd airbox and replacement gasket...baby one more time!

OK,
I have this 2nd filter on my 2nd air box while some other imprezas 99MYs have none. So I thought I would like to take it away. Does it make some performance improvement by replacing it with the gasket?
I have a K&N filter which draws air from the fender and a 2.25" catback exhaust system. Any thoughts on this replacement gasket thingy? Will I get a flat spot which results from running lean? I am trying to avoid getting an AFC. Don't really want to jump on the bandwagon thingy if I don't have to. Alot of money for a lil Nintendo...
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Old 05-16-2000, 11:01 AM   #2
Bohanan @ work
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FWIW I am running the stock intake on my '99. I received the air box gasket first and installed it running the factory air filter. I noticed a little more noise when getting on the throttle hard and it revved a little smoother. A week later I installed the Amsoil filter and noticed a big difference. Easier to rev to redline, a little more aggressive sound, and a big grin on my face! I personally think it's worth it. I don't know the long term effects, if any, on the throttle body and engine by removing the second filter. I had several thousand miles on the car and the second filter looks brand new. Anyone care to add their two cents?

Adam
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Old 05-16-2000, 11:03 AM   #3
Tim Prudence
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Gambit,

I had it and it worked. You could actually feel a little extra from about 4000 and up. You won't need an AFC, don't worry about going lean, this only happens when the MAF orientation is changed (like with an aftermarket intake with it's own MAF bracket).
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Old 05-16-2000, 02:09 PM   #4
Gambit
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I heard that the 2nd filter is supposed to prevent some sort of air turbulence from the TB back to the MAF.... How is the install....dumb question. should be the same as with the first filter.

tim : can u please elaborate on the MAF orientation? You mean moving the MAF around? I thought lean is caused by lack of too much air going into the engine?
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Old 05-16-2000, 02:22 PM   #5
Tim Prudence
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Well the leanness is actually caused by a MAF misreading, ie. the MAF reads a lower number than actual flow. This only occurs with aftermarket intakes becauses the MAF is not protected from turbulence.

You won't need an AFC.

The install is easier than the primary panel filter because the box is easier to take apart, and the gasket fits a lot better than my K&N did.

The secondary is supposed to protect the MAF from engine backfire. Maybe you're opening yourself up for a little risk, but mine lasted 18k miles of hard driving with this mod and I didn't have a MAF failure. I've also added another 1k miles of turboed driving and my MAF is still going strong (still on stock piping though).
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Old 05-16-2000, 09:50 PM   #6
Gambit
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Engine backfire? Ok that's like this loud gunshot phenomenon right? How does that happend and can I prevent it?
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