first off,I drove two zx-11"s for 13 years.I know all about speedo error.I wish they both went as fast as they thought they were.I almost bought a zx12R because top speed was 308 kph,which i think is about 192-193mph.The salesman where I bought the 10r told me it would shut off at 179mph.When I drag raced this bike the speedo was right on at the finish line.also before I repaired the shut off,this bike always would quit running at 179-181 mph.whether the tre eliminated it or the power commander eliminated it ,its no matter.