How many miles are on your tour? As an FYI the sulfur smell is the catalyst not burning all the leftover gases in the exhaust. It is USUALLY the first signs of cat failure. You will also get a CEL with codes p0420 and p0430 which will be catalyst maximun efficiency reached bank 1 and bank 2. The good news is that if your car is less than 8 years old and under 80k miles the cats are covered under warranty. So worry not there is always a remedy whether it be warranty or a good reason to install headers. LOL
