Not sure on the 89 but my knob unscrewed and then the black plastic just popped off and than took out the shifter from there. I recommened putting the silencer boot back on the tri-ax. My instructions said not to put it back on unless you really wanted too. I did not put mine on and my shifter is loud. The Tri-ax is one of the best improvements I have done. I love my short throw.
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2003 Sonic Blue Cobra
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