i believe mazda seals are the only ones that are truely proven....

 

WELL, I will let you know ,I just bought an RA basic kit, this is about my 15 th rotary engine rebild, some turbo some N/A, some rebilt with OEM, some with ATKINS, some with HURELY, the N/As any of them work well, but turbo engines still dont like detonation dont seem to matter whos seal it is, but discount the apex seals,I was impressed with the quality of the RA o-rings and other small parts, much better than OEM, and there literature for assembly, some nice info there, this kit is going into an N/A so I feel comfortable with it. now the next engine online is an FD single turbo shooting for 500hp, I think I will still do R/A kit , but much more expensive apexs, like ceramic, they cost as much as the whole engine. anywho thats my take on it.