It's the o2 sensors on the 96-up cars that are the most sensitive since OBD2 came out. Dallas Mustang sells the MIL eliminators to disrupt the signal. When I had an offroad pipe on my 96 the same thing happened.
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(96Cobra/softtop-3.73,almdrvsht,fancontrl,steeda sbfrmes+shifter,eibachspgs,pulleys,Bassani X pipe,C&L 80mm
Cobra DYNO 301rwhp horsepower
93 Ford Probe Gt(slower but turns)
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