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what do u need it for
dont buy 2nd hand microtechs unless they come of same engine u plan to run them on
personally if its for a good engine spend the money for a new one

if u cant afford 1500 for a mid range aftermarket ecu then dont touch the engine

1 in 8 ro 1 in 10 aftermarket ecus i do that are 2nd hand usually turn to poooo