MXA PRODUCT TEST: Pro Circuit KX250F TI-4R Exhaust System; The Same Pipe That All The Kawasaki Stars… Mar 28, 2009 WHAT IS IT? An ultra-trick exhaust system designed to boost performance on the 2009 Kawasaki KX250F. This is the exact exhaust pipe that Ryan Villopoto used on his 2008 AMA Championship KX250F. Read More...