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> Factory Air Filter Question
chopper666
post Aug 1 2008, 09:04 AM
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Hello all,

I have just taken out my standard air filter to replace it with a K&N panel filter.

The bottom of the factory air box is covered in a thin layer of grey foam. Is this required? surely it is just a further restriction.


can i take it out?
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Dandle
post Aug 1 2008, 10:52 AM
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No its not required its there for noise dampening. Its a common mod to remove all the foam out of the airbox to get a better induction noise. You will actually hear the turbo with it removed, its not massively loud or anything just you can hear its there.
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chopper666
post Aug 1 2008, 11:36 AM
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thanks dandle. I know what i'm doing tomorrow morning then!

is it just that bit at the bottom of the air box, or is there more to be removed?
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Dandle
post Aug 1 2008, 11:54 AM
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Theres the bit in the bottom and also another load in the lid. I took mine out carfully so i could put it back in if i wanted. It never went back in the car though.
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chopper666
post Aug 1 2008, 12:28 PM
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thanks dandle, i will take the foam out tomorrow
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chopper666
post Aug 2 2008, 02:28 AM
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drove home from work last night about 15 miles - the difference is amazing from stock filter to K&N - have just been out and pulled the foam out of the airbox, will go for a drive in a bit and see what its like
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chopper666
post Aug 2 2008, 03:35 AM
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wow! just got back - its a really good mod.

not too loud or intrusive, but worthwhile in my opinion. cant get over how much the stock filter smothers the car :liebe011:
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Dandle
post Aug 2 2008, 03:53 AM
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Yeah a K&N filter really imptoves the breathing high up the rev range on the T4s. Glad your happy.:)
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chopper666
post Aug 14 2008, 05:30 AM
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could the factory air box be drilled to allow further passage of air?
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Dandle
post Aug 14 2008, 08:56 AM
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It will give you slightly more noise but will allow hot air into the intake so may reduce power a little. Personally i wouldnt bother as when you want to sell the car youll have to explain why the airbox has holes in it.
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chopper666
post Aug 19 2008, 08:24 AM
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oh yes, didnt think of it that way - will just leave it stock.
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TheGreekMason
post Aug 19 2008, 03:02 PM
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Drives: 1996 Volvo 850 R,1968 SS clone Camaro,1963 pan/shovel chopper, 1949 Panhead bobber, 1967 Triumph Bonneville, 1967 Honda 175, 1999 Suzuki Hayabusa, 1996 Impala SS big-block, 2004 Mercedes E500 (the mrs.), 1934 Dodge,
you can always find a junker and get the airbox, try the hole trick and see if it works. the consensus on the 850 forum is split down the middle, half who have done it have reported gains, while half said it didn't do anything. the way i see it, if the inlet on the bottom of the box where airflow comes in is a tiny hole, boring it out to make it larger would increase the airflow in. i've done it on my 'busa motorcycle and saw an increase in throttle response. in my R, i had removed it and replaced it with a cone filter but drilled out the bottom plate. to me, the throttle is more crisper, to me anyway. either way, the k&n filter is a plus, as you have seen. good luck and keep us posted.
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chopper666
post Aug 21 2008, 09:50 AM
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another good idea! i will keep my eyes peeled at the scarp yards when i get a free weekend
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