Simple answer thinking that 3, or 5 or 10 microns is best is not necessarily the way to proceed. For those that are not super technical ( that would be me ) , the SRT Engineers explained years ago at a Viper Owner's Invitational that optimal flow rates , drain back capabilities and strength were important for the G forces a Viper can attain, as well as with the amount of oil movement in the pan even with swing arms , etc. The filter was designed and tested , because some filters in the past had seen paper elements start to separate under severe race conditions. Sometimes too tight a filter element is very restrictive and those of us trying to second guess Engineers often are out of our element. The decision to actually do a Viper Specific filter , working with Wix, at the time, was quite a special situation. I often just tell clients if they want to use a filter designed just for their car or one that was made for a multitude of machines. You can make your choice, but for those that track , a Viper filter should be mandatory - IMHO.