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  1. Kawasaki Ninja 400/Z400 Classified Forum
    I only rode the Ninja 400 about 150 miles with these installed on it, with my Delkevic full exhaust system. Nearly brand new and I paid nearly $900.00/shipped for these just a month ago. This made a huge difference in smoothness and throttle response, as it is much faster than the stock ECU...
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