deep sump or shallow sump 999?
given they're the same chassis, albeit with different sump designs, the s4rs headers and st4s headers may work together to give you testastretta head ports and dual outlet crossover. if you run some sort of st4 muffler then the pivot lets you put them where ever you want. get the mufflers cut off the inlet tubes and rewelded to give the angle you want, that;s what i had done to make the st4 exhaust on my 851 look right, as the usual st4s mufflers droop down from the inlet tubes.
apart from that it might fit up ok.
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