Cycle World 2X2 Speed Wars had the same two bikes tested in 2006 and again in 2008. In 2006 the ZX-14 had more peak HP than the Busa and was quicker in the 1/4. The 2008 ZX-14 exhaust system hurt the peak HP. I was going to buy a Busa as I rode a 2000 model Busa a friend owned many times but the ZX-14 Stops Much better and I like the looks better. Both are Great bikes, I guess it comes down to which one you like the best. For the street daily rider the ZX-14 is my pick. Drag Racing the Busa has more performance parts.