Yeah, it's like 3 inches. Personally, i would not reccomend even using the filter that comes with the kit. I have read about a few people that had it fall apart. I put on a k&n as soon as I put the kit on. Sorry for rambling, but yeah, 3". later, justin
haha yeah I didn't use that crap filter. It's pretty weak quality, you can get an even better one on ebay for like 15 bux and it'll have a neat little twisty pattern and an opening on top for more air flow. Right now I"m using my HKS I sold that crap filter to my friend hehe. If you do use it I suggest you glue the top of that thing on cuz it came off and stuff.
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