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Well ended up making a trip to Mexico last night and a very cocky CTS-V got schooled by a F250 Diesel He said "Damn didn't know trucks could run that fast" his mods were CAI, exhaust and a tune on an LS6 F250 bully dog package
Its a 6.4L I think its on its 2nd engine IDK honestly if its the same or something different that was his first run with the new engine and turbo(s) setup