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I use to have one one my evo. The filters get very expensive. Like $25 each. And you can totaly tell when they get dirty.
I droped in a new filter every 3 months. And I tell you when you get a new filter in there, the throttle response and power increase is very noticable.
I just chucked about 10 old filters or I could have given you a size,, before they form into a 1/3 circle.
Just as a guess I think the filter is 12" diameter. Folded in the hks housing I would guess 10" diameter.
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