08 Mustang GT with no check engine light

Purchased an 08 got, 4.6L with long tube headers, straight piped, put back in standard exhaust, cats, mufflers. Went to go emissions, failed cause the check engine light doesn’t light when the key is turned on. Any suggestions? Help
 
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Make sure the previous owner didn't take the bulb out or cut a wire, if they did go back and slap 'em.
Sorry, can't stand devious sellers, my opinion is they should pay for repairs but I digress, welcome to stangnet.
 
If the CEL doesn't come on it may signal a problem with ready ness monitors during the vehicle self check on start up, I don't know what inspections are outside NY but here they don't use sniffers they riun emissions test by hooking up the inspection machine to the OBDII connector.

Brent any codes?
 
Either way, if the emissions are within spec, why should it even matter if the CEL works or not? The whole idea is to reduce atmospheric pollution but for the vehicle inspectors, the main priority is to make money instead.