For those who haven't already completed this easy "mod", here's a video of the process! Filtered air goodness is less than $20 away for many of you 100 series LC owners. I can't say I've noticed any difference in air quality, but I wasn't necessarily expecting a noticeable improvement. If I had access to an air meter I'd do some testing to prove any objective difference, but I don't have that access now so I'm just imagining that it's cleansing the air around me. Amazon link to filters: Amazon.com: TYC 800099P2 Lexus Replacement Cabin Air Filter: Automotive **Note: the filters DO come in pairs. One box has two filters. When I bought it the listing was unclear, but they do, in fact, sell them by the pair.