MSD- 83521 Dist, Ford 289/302, Ready-To-Run, Stl Gr

1987-1993 Ford F-250/F-350 trucks with a 7.5L engine and a 2.50-inch catalytic converter. - Moderate sound

1987-1996 Ford Bronco with 5.0L or 5.8L engine using a slip fit catalytic converter. - Mild sound

1987-1996 Ford F-150 truck with a 4.9L, 5.0L or 5.8L engine. - Mild sound

1987-1996 Ford F-150 with a V6 or V8 engine. - Aggressive to moderate sound

1987-1996 Ford F-150 with V6, V8 engines. Fits 2/4 wheel drive, all wheelbases. - Aggressive to moderate sound