G’day Plassy,
Started running an advised Italian ‘BMC’ filter system (K&N same same ish) a few years ago in the 6.5 ute with 10% ish seemingly good power success in our somewhat dusty hills for performance.
Shiploads easier though just 2 minute swapping an OEM $25 paper filter into the Mrs 4.2TD family wagon whenever the roads get too chalky.
Many many years ago did have a similar oil type air filter on an FJ55 and was laughed at by my Cairns mechanic before heading up the Cape and handed me 3 x paper cannister filters and a sabre saw :-)




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