Hey everyone, I am looking into purchasing a 99 Suburban with a 454. When the owner started the engine I had the hood popped open and was peaking my head inside to see/hear the startup. As soon as the engine started I could smell the very pungent smell of exhaust. I'm pretty sure it was coming from the engine and not the tailpipe. Any reason for this? Anything I should be concerned of if I purchase? Otherwise the engine sounded pretty good!