Just spotted this today high altitude testing in Colorado. I heard rumors that it was running around Brighton. I pulled over and got pictures as it passed. No vent ports but the grill was different, the exhaust tips different and the sound oh the sound!
They usually do that here in Colorado with the drivetrains we see many test mules running the high plains and I 70 up the mountain. I have had a few fun encounters with these cars in the past. It definitely was a different motor!