I think ford recommends around 80-90k. If you are unsure, just play it safe. bent valves and mangled pistons aren't worth the $300 you'd spend doing the timing belt in advance.
Droste Drummer. Droste like Frosty.
00" Red ZX3: Volant, ported throttle body, titanium wrapped SVT header, 2.5" exhaust, Magnaflow res/muffler, FR UDP, Mac cam gears, Lowered 2", Koni's.