What does the exaust smell like on a 300zx tt. I just noticed that when I pulled into my garage, I was letting it idle as I always do and got out to check my fluids and my stealth box to see if the bolts are loose or anything. So I get underneath my car and the exhaust is blowing out of the tail pipe and it smells a lot of sulfur. Is this how the exhuast should smell...like sulfur. I went to the front of the car and smelled and I didn't smell any sulfur. Just coming out of my exhaust. I might just be tripping but I'd like to know if this is normal or not.