No, your check engine light will not come on. On pre-95 stangs there are 2 02 sensors and they are before the cats, therefore they still send the correct reading to the computer after deleting the cats. On 96+ stangs, there are 4 02 sensors, 2 before, and 2 after the cats. That is why 96+ need the MIL Eliminators.
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1991 Mustang GT Conv: 58,000 original miles, 2nd owner.
Engine: FMS 65mm tb/spacer, C&L 73mm maf, MAC cai.
Drivetrain: Built AOD w/ Edge 2800rpm lockup converter, hardened 3-4 inner shaft, Trans-Go shift kit, B&M supercooler, FMS 3.73 gears & aluminum d/s, rebuilt traction lock.
Exhaust: BBK unequal length shorty headers, BBK o/r h-pipe, Flowmaster 2 chamber mufflers.
Chassis/suspension/brakes: Kenny Brown supersubs.
The rest is stock.
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