A quick question considering VINs.



I have -91 Sierra Cosworth (red top engine 4x4) and in my VIN plate, the number ''15'' does not say K.D.SVC REF, instead, it says ''EXH. EMIS. E''. So its exhaust emission ''E'', but what does the E mean. Is it just Ford's way to tell the car did not have catalytic converter nor lambda when it left the factory? Any help would be appriciated.