17-03-2011, 02:55pm
Definitely mapping, had an XB GT 4V, 4 door years ago that was tuned for it back in the early 90's and she went like f*#$. Friends that had XU1 Toranas, fast bikes back then , and other assorted chariots used to be in awe the way this thing went. But untuned there was not much difference.