20k? Royal Purple filter

I don't know if you can really say any of them are "copy" Amsoil and Royal Purple are both marketing companies that buy filters made by someone else.
Eh, they have somebody else make their filters. The claim to fame with the AMSOIL filters was that they were buying Donaldson's Synteq media and having somebody (Donaldson, WIX, Champ...etc) assemble the cans using that. RP has never made a claim of being that involved in the process.
 
I’ve run the OG Ultra 20K-but I stepped up to 20K gradually, cutting filters open, to make sure there wasn’t a lot of carbon/dirt buildup. I wouldn’t try it with the Express 6.0 in my sig, it launches quite a bit of carbon, plus the XG10060 isn’t exactly big, it’s probably smaller than the XG3600 the xB gets. I wouldn’t hesitate to run the RP XG3600 20K on the xB, if I ever run out of OG XG3600s (not likely, body won’t last another 20 years).
 
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