It’s been a week since I retrofitted my 2014 Ram 1500 for a cabin air filter. There has been a noticeable improvement in air quality, both in reduced dust, and general odor reduction. The overall install process is pretty easy. Use a good utility knife, preferably a fixed blade model, and have a few blades. As for where to get the retrofit kit, there are a number of sources, I bought mine from IDParts.com for $29 shipped.