Buyers distinguish the 1.6L cars' smaller 6-inch viscous LSD (vLSD) from the 7-inch Torsen found on 1.8L cars, check whether a diff was swapped, and prize the Torsen; window stickers document factory-added vLSD on early cars.
1.6 vs 1.8 and the LSD (VLSD vs Torsen)
Mazda MX-5 Miata (NA) · variant