My air works great in my 2016 Passion but I want to give it every advantage that I can. K&N does not make a cabin air filter for Smart (They do make the engine air filter, easy to find). The specs on the regular fiber/paper in-cabin filters out there for Smart 453 are 8.5in x 8.5in. After...

I actually have two questions. First question; how do you change the AC Carbon activated (cabin) filter? And second would there be any benefit of installing a K&N air filter. Thanks for you time I have a New 2012 Passion with 2600 miles on it at this time. I LOVE driving this car

Mods, admins: If this can go somewhere more helpful put it there, please. I didn't find this elsewhere, so I thought I'd pitch in. On a mission to not pay such silly prices for a cabin air filter from the dealer, I did a little experiment. I took measurements from the cabin filter in the...