I put a cabin air filter (FP-66) in my 2008 the other day. Those with 2008 and newer models should note that the process documented here in this thread is for the previous generation and is not exactly the same for the Gen2 FEH. It's very similar, but there are some differences. Of note, the cowl can not be removed without removing the wipers. And, even if you were to remove the cowl, the air intake box is not fully accessible as it is partly covered by the firewall in the newer vehicles. Also, the FP-66 must be slightly deformed to fit in the box. It's "almost" the right size but not quite.