So I had stock exhaust manifolds with an off road X and just switched to headers and off road X. My wife said the exhaust smell is not unbearable. I don't see how this change could have that much affect on the smell coming out of the exhaust considering both systems had no Cats...I too feel like the smell is really strong. I have had it out for around an hour or so cruising around to see if the new pipes just needed to burn off. Doesn't seem like it is going away. I just sent a log to the tuner to make sure all is in line. Thoughts?