Here's two I made last weekend. But they are not for everyone. Both use K&N filters. You can get K&N to custom build any size filter you need to fit whatever your fabricating. I try to stay away from foam filters as they don't flow enough air and if your trying to build a smaller filter they really won't flow enough air and if they do, they won't filter it. But I prefere airhorns and have had no problems for the last 20 years running them. On gravel roads quite often too.
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