I think what they are reccommending is map 503, which requires ducati eprom 060. (I dont think they do an eprom marked 'stock'

)
(Not sure what is different to map 504 though !)
(What code is your 'performance' chip ? There seems to be more than one - I have one marked 748SPS 066)
That is where I seem to be heading, when my latest ebay purchase of a set of 45's arrives.
I can find no good reason why any 748 that isnt raced is fitted with 50mm cans. A setup that leaves a gaping hole in the midrange seems to be typical 'that'll do' attitude that ducati have now. I'm sure they fit the 50s to the 748 SPS and R just for marketing dreams.
If you tell me how you get on, I'll share my 'secrets' too
