Designed for use in the Raceworks AN-10 Fuel Filter Housing. Filter elements have a total filtration surface area of 374 square centimetres and are E85 safe. The filter elements are suitable for high horsepower applications (1000HP+)Which Micron level is suitable? The lower the micron level, the finer the particle it filters, but the more restrictive the filter is on flow. Raceworks recommended a 100 or 75micron filter for use pre-pump, and a 40 or 10micron filter for use post-pump (Pre injectors).