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The settings HMF told me to put my Optimizier at is 1.5/3.5/3.5 I think the FMF is the same since they are both Dobeck programmers.
 

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I just went and took off my filter. The bottom of the filter has F045A6 but the top of the filter has B045A6 and K&N's website dose not pull up either number :confused:
 

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I just emailed K&N to ask them what this filter is used for. The filter fits very good and when I removed it I had a lot of sand in the air box and the outerwear prefilter had dust on it but the filter looks perfect still.
 

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smo0oth1 you are right, K&N emailed me back to tell me the reason the filter has 2 numbers is because it is a universal filter made from 2 different filters and the part number is RU-4740
 
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