These are actually for the stock twin turbos on FD3S rx7's but can certainly be used on other projects. Coupler size is 2 3/8 to 2.5" ID. The Trust filters are easily disassembled and the media can be washed without removing the filter from the car. Of course we all know the K&N's are reusable as well.
All filters are used but in decent shape.





Here's a borrowed image of the K&N units since I haven't taken any.


$35 shipped for either set
paypal preferred to morganf1@charter.net