If you go from a 5.3 to a 6.0 you will need your PCM tuned...
If you go from a 5.3 to a 6.0 you will need your PCM tuned...
http://i121.photobucket.com/albums/o...IMG_2118-1.jpg
1999 Silverado 1500 Z71/5.3 to LQ4 6.0 swap/ CAI/ crappy exhaust/ tuned by COWL327
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