I made one out of stainless tube. Swaged it up to a snug fit at work. Tigged a disk base on it to protect the bottom of the filter. A couple of slits allows a hose clamp to keep it snug. Oh yeah a drain hole in the bottom. I got a pic on my puter somewhere if anyone warns to see.

Cheers, Richard
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09 America, Staintune Pipes, K&N, Breathe, Hagon Nitros, AI & O2 removed, tune 20184 (modified), MTX-L a/f gauge