Brz was purchased a few weeks ago (2014 model) and I am going through everything trying to get all the maintenance I can think of done to it. I just took out the in cabin air filter because my one from @
FT-86 SpeedFactory comes in tomorrow.
This is what 2 years of not changing the filter looks like..... I would assume it works on the same principals as an in home HVAC system meaning if its a daily i would change once every other month at the least especially if you daily drive it. The more build up = the harder the system has to work to cool/heat the air.
My poor AC....