Timing adjuster for those who wish to adjust the fixed timing of thier 96-01 Mustangs. To advance or retard the timing with the Adjuster, owners simply need to loosen the three Allen-head bolts and rotate the clearly marked, laser-etched sprocket on the crank-shaft pulley. The adjuster gives 20 degrees of total adjustment range, 10 degrees advance and 10 degrees retard.