The 23604 was designed to provide full filtration at all times in a race only application. This type of application will use a non-bypass type filter. This does however assume that the filter is changed frequently and that the filter never becomes clogged with contaminants.
The 23604 can be used in a street application however it is advisable that the filter be of a bypass type. This is so that if the filter should become full of contaminants (typically more are encountered on the street due to poor air, more carbon build up due to extended idle time and the filter is not changed nearly as often as would be expected in a purpose built race engine) that the oil will bypass the filter and continue to flow through the block thus not over pressurizing the filter.
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