UNI also makes a sheet of "universal" foam for elements. You cut to fit but its good stuff. I've used this a lot in custom air boxes and filter apps. I personally have Tyga stuffers with HRC reeds.
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Andre E. Benguerel
1996 Honda NSR250R
Daijiro Kato/Fortuna Replica #74

2000 Honda RS250R (NX5)
2008 Honda RS250R (NXA)
AFM Expert #430