I've finally run down a dual density material for air filters; first two products are for Spree and SA50. This is a dual-density foam, with free-flowing top layer and OEM-spec bottom layer. Available on my store, links below. Have fun! NG
Spree: https://www.ebay.com/itm/142574699027
SA50: https://www.ebay.com/itm/142574702714
New product: Performance air filters for Spree, SA50 Elite
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New product: Performance air filters for Spree, SA50 Elite
Admin, Hondaspree.net
Buy air filters and gaskets here (Ebay): http://stores.ebay.com/noiseguysstore
Buy air filters and gaskets here (Amazon): www.amazon.com/shops/spreepower
Buy a t-shirt here: https://teespring.com/stores/spree-powersport-products
Buy air filters and gaskets here (Ebay): http://stores.ebay.com/noiseguysstore
Buy air filters and gaskets here (Amazon): www.amazon.com/shops/spreepower
Buy a t-shirt here: https://teespring.com/stores/spree-powersport-products