So as many Supernatural Fans may know, the Impala hasn't been in the show very much these pasts episodes. The reason for this was because they (Supernatural Crew) were upgrading the Impala with a new engine and $30,000 worth of upgrades. Tonight I was able to grab a few screen shots of the upcoming season finale of ''Survival of the Fittest."
Here are the noticeable changes in the Impala:
and tinted upper windshield.
tinted upper windshield: