2004 gmc envoy_sle_xl
I got my tune, i like it, and i've been trying to get a hold of pcmforless for literally nearly a month by phone. They simply won't answer their phone and won't return the couple messages i have left. I received my tune last week, and i wanted to know what information i must send back when i send them back my original core pcm. does anyone know? please help i have to mail this out in a couple days.