ZX4RR Sound and Review | Kawasaki Ninja ZX-4RR

Kawasaki Europe's announcement, revealed the Ninja ZX-4RR (plus the ZX-4R variant that isn't being offered in the U.S.) will make 57 kW (76.4 hp) from the 399cc 16-valve Inline-Four, and 59 kW (79.1 hp) with ram air