Where did they get the power?

[WAYNE]

Hi to all,just curious. Does anyone know where the factory got the extra horsepower from the 2000-2001 model years as compared to the 99.
Maybe injectors or ECM programming,im not really sure anyone know?

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99 QC. Sport,2WD,SB. autoK@N cone filter,275HP. RV injectors,custom 4"exhaust,roll@lock bed cover