Was the truck teal blue? If it's the same one I'm thinking of, I remember reading about on a DIY Autotune/MS2/3 forum. Even if it isn't the same truck, a turbo'ed Magnum Dakota would be pretty rad.
I was never able to find much info. Seems like the color is right, but can't say for certain I ever even found a picture so could be I am just fabricating the memory.