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Garrett PowerMax GTP38R Turbocharger Fitment: 99.5-03 7.3L Powerstroke Engine Serial Number: 869,813 and after Engine Build Date: 12/08/98 and after 1999 Model Identification: Early 1999 Models: V8 Powerstroke Fender Badge and 4 Bolts Securing the Compressor Housing. Late 1999 Models: Powerstroke Door Badge and 5 Bolts Securing the Compressor Housing.