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there's loads of threads on this subject with lots of pros/cons and suggestions, use the search the function to find them
I've used both a standard STI panel, cosworth panel and a knN panel, all performed fine. I've used an ITG panel filter before on a classic and it destroyed the MAF. Avoid anything thats heavily oiled.
the Cosworth panel is un oiled as is the sti, the cosworth filter is not a lifetime one though.
You'll be fine on a oem one just change it more often which isn't a problem as they're cheap from a motor factors. If you want an aftermarket one I use green panel filter which works well but needs cleaning and a light re oil. Cheers Marc
DO-LUCK was tested by Banzai or Jap Performance and proved to be the best flowing panel filter for the Impreza. Rolling road results speak for themselves.
But due to being coated in oil will clog your maf up
Originally Posted by Trinity
DO-LUCK was tested by Banzai or Jap Performance and proved to be the best flowing panel filter for the Impreza. Rolling road results speak for themselves.