This has to do with a 1991 Cosmo 13B Sequential Twin Turbo. I'm in Calgary Alberta and would like to know what cars air filter will fit in the stock air box as a replacement. The RX7 one is slightly smaller. Thanks in advance.

 

Measure your filter & enter the dimensions on K&N site... For more cosmo info check out Ausrotary.com or DMRH.com.au or PM David Morris directly at DMRH..

http://www.knfilters.com/search/universal.aspx

http://www.knfilters.com/search/univ2.aspx?ID=S0005