Black VX - I just looked up the EGR valve in the parts book that I have - it costs $158.82, and installation should take 36 minutes. Their labor rate must be $400/hour if it cost you $400 to get this done! I'd go back and talk to the manager, they usually like to maintain their reputation with Isuzu and the BBB; threaten to take it there, or talk to the owner of the dealership. Hope it works out for you!