I'll look again but I didnt see anything. None of the pipe is original..it's all been replaced... Didn't see any sensors in there but I'll have to double check. For me not to throw a Check Engine light without O2 sensors, the light must either not work or the ECm (is that what you call it in fords?) was tweaked with to work without O2 sensors.
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'91 Mustang GT 5.0 AOD Daily Driver
Current stats: NEW 302 short block, E-303 cam (@.050, 220/220, .498/.498, 110 degrees), 1.6 roller rockers, Performer RPM heads (aluminum, 1.9/1.6, 60cc chambers), Cobra intake, Granatelli 75mm MAF, Billet AFPR, Equal-Length Shorty Headers, Off-Road X Pipe, Flowmasters, 4.10 POSI
13.73 at 103.8, ~2.2 60'
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