AEM21-204DK Universal DryFlow Clamp-On Air Filter: Round Tapered; 3.5 in (89 mm) Flange ID; 5.25 in (133 mm) Height; 6 in (152 mm) Base; 5.125 in (130 mm) Top

I purchased this filter to replace the K&N oiled style filter for the aftermarket Roc Euro cold air intake because I wanted a filter that could be cleaned/re-used that didn't have to be oiled. The AEM website was great as it provided instructions on how to measure the existing air filter so I could pick one from the AEM catalogue that would fit.I have been using this filter for about three years now and it has held up great. I definitely recommend it if you're looking for more airflow over the stock filter with the added benefits of being able to clean the filter without having to buy messy oil and not having to oil means there is zero chance of damaging air sensors by over oiling the filter.As a side note, I did notice that the filter is not as loud as the K&N oiled style filter that came with the Roc Euro indicating that it probably doesn't flow as well, but I think the trade-off is that it likely provides better filtering than the K&N.

It filters air. It does so very well. It is washable, and obviates the need for purchasing disposable filters. It's not cheap, but you only have to buy it once. It's pretty sharp-looking, but who's going to see it? It works well, and I would buy it again.

Fits perfect! Works great. Nothing wrong with it

I noticed a moderate improvement in my fuel economy using this filter instead of the filter I had before

The perfect replacement for my AEM V2 short ram intake for my RSX Type S. I cleaned my previous filter numerous times, but eventually, the filter was getting worn out and needed to be replaced.