Thanks for the link.
Looks like that test was done on the CL9 not CU2 model.
I emailed K&N directly and asked if it was possible to use the CL9 k&n intake for Cu2. Here's there response.
Thank you for your e-mail and interest in K&N products. Unfortunately I canít recommend the 69-0026TS since it only references the Acura TSX (http://www.knfilters.com/search/prod...Prod=69-0026TS). The problem may be that it will not bolt on correctly and also because we havenít done a complete test of it we donít know what performance gains you may get if any.
I'm sure many people have slotted it in a CU2 but just want to get all the facts and figures before I proceed with purchasing one.