LSD was a standard option, some do and some don't. Most do, but it's a shitty ratio like 2.77

Easy way to tell is to look at the back of the diff and see if it's got a big tag that says LSD. Or rip a burnout lol
Pod filters will make negligible difference to power/economy. Basically it just sounds/looks better.
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Proud TQE Operator and President of SEFAG - the Society for the Elimination of Ford Automatic Gearboxes

Pacemaker headers + 2.5" exhaust
EF Fairmont interior
MP3 player
Lowered King springs
5 speed manual
EF motor
Newest mod: EF Ghia wiring loom and dash