I posted over on the V12 section, my changing to use of the Bosch +4 spark plug - “Spark plug Bosch 4459 as replacement for NGK BR7EF” - as explained in the long post, I did use the Bosch 4457, not 4459, spark plug - I did post pictures of the new spark plug and pictures of the Champion spark plugs I removed ( had expected to be removing NGK plugs so that is why the title started out that way) - hope this helps, thanks, Tex.
So, of the three brands, which ran best for you? which ran “cleanest”? 
Recall your “post/Topic”. How do they light over 5,000 RPM.??
AttnDallas - over in the V12 post are the pictures of what the removed Champion plugs (that the previous owner had installed) look like - I have not ran the Bosch plugs very long yet and I do not know what the NGK plugs would be like so no comparison info yet - Tex.
Eric - have not had the rpms up high yet but will post a follow-up when I do - Tex.