does 2004 Mustang cobra need retune for smaller pulley

SVTorDeath said:

The DiabloSport Predator handheld tuner P/N: D/SU7142 has the ability to tune for up to 14lbs of boost for Terminators with a smaller pulley.

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I would never trust a 350 dollar handheld tune on a $7000 engine. Custom tune from a reputable tuner is the only way to go.

OP, Before purchase I would get a leakdown test preformed to see if the previous owner hurt the motor pulleying it with no tune. Also check to see if there is anything else out of place.