Dry filters was the reason I choose Injen. I would give up a wee bit of flow for better filtration. Stillen is prolly using an oiled cotton based K&N type air filter. On the other hand Stillen' air filter could be swapped out for an Amsoil dry filter. Injen had the hamburger wrap around CAI with dry filter for the 350Z. I wonder why Injen went with the Nismo 350Z CAI design for the 370Z? Looking for more power, better flow? Or they did not want the same design as Stillen's?
A used oil analysis is a mans best friend.
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