I'm replacing the filter on my SRI. I can't remember what I bought last time. The AEM site has part # 21-203D and 21-203DK. The dimensions and description are the exact same. Anyone know the difference? I sent them and email but haven't gotten a response.

 

I think one has an internal anti-collapse frame in it....the other one doesn't....I believe R2C is a better filter!

 

The dimensions are not the same. There is a small difference.

The 21-203D has a filter element length of 5.063 inches (dimension L)
The 21-203DK has a filter element length of 5.125 inches (dimension L)

The 21-203D has a mounting tab length of 1.5 inches (dimension FL)
The 21-203DK has a mounting tab length of 1.625 inches (dimension FL)

http://www.carid.com/aem/round-dryfl...FdgPgQodaJUAKA

http://www.carid.com/aem/round-dryfl...FQckgQodKWkAgA

 

Thanks for the responses. The measurements above are different than the ones on the actual AEM website. On their site they are identical in specs. I called to try and get a final answer and was told by the CS rep, after being put on hold, that they are the exact same filter but the DK is normally what they sell???? Oh well not sure what that means but DK it is.