Here is a link to discussion and pictures of two Honda filters cut up and dissected. One is made by Fram and the othere Filtech. Filtech is of better construction. The author goes into greater pictorial detail than any other I have seen. There are also photos and discussion of Amsoil, Bosch, Purolator, Napa, K&N, Toyota, and Fram Extra Guard. One thing I have not figured out is which has a bypass valve at the open end of the filter and which at the closed end.
http://www.acuramdx.org/forums/showthread.php?s=de2987f3ea11f7e4552f0012002d2a66&threadid=9528
[ January 27, 2003, 10:28 PM: Message edited by: thrace ]
http://www.acuramdx.org/forums/showthread.php?s=de2987f3ea11f7e4552f0012002d2a66&threadid=9528
[ January 27, 2003, 10:28 PM: Message edited by: thrace ]