Has anybody heard of these and have an opinion?
https://www.amazon.com/Coffmans-Exhausts-Kawasaki-2006-2007-Sportbike/dp/B01A3LPMQM/ref=mp_s_a_1_2?ie=UTF8&qid=1542400749&sr=8-2&pi=AC_SX236_SY340_QL65&keywords=coffman+zx14r&dpPl=1&dpID=41R7qNwMvlL&ref=plSrch