I think 87 is making my Cats and Exhaust smell like rotten eggs....I just started to notice it. Do you think that is what its from? Or is there somthing else on the horizon. Also, when I picked it up from the dealer it had a top end ticking noise. I think they hot rodded it to hard or something. I am taking it to the dealer on Wed to see if its a lifter or a noisy injector. What do you guys think?