I get them cheap free from one of the BMW aftermarket parts distributors who semi-sponsored one of my builds, and I originally was getting KN but asked for the AFE as I have heard good things, and they make the absolute best bar none performance air filter (ProDryS) for racing and extremely high specific output use, and I trust the company.
Plus, I am like 99.99 percent certain they are made by Champion Labs, but they're actually better designed, with more pleats, SS inner reinforcing mesh, etc than any other ones I have seen. I will see if I can send a filter in for analysis somewhere, because even my track cars that run them show abnormally LOW wear metals.... ?
Plus, I am like 99.99 percent certain they are made by Champion Labs, but they're actually better designed, with more pleats, SS inner reinforcing mesh, etc than any other ones I have seen. I will see if I can send a filter in for analysis somewhere, because even my track cars that run them show abnormally LOW wear metals.... ?