Just a small update – new air filter ordered for the Evo (Amsoil EAAU4560-EA). The old one was looking quite worse for the wear and checking my logs, has been trucking on for 3 1/2 years – well past its prime. The availability of the EAAU4560 seems spotty, so I ordered 2, which should last me a good while. Other air filters don’t seem to have as much volume as this one, especially considering the induction top.