I just had my exhaust manifold gaskets, my cat, and few other odds and ends done at Houston... who knew it would change the way it ran? Quieter, more power, smoother.... And I've been missing all this for over a year. Such a big difference-- at first I wondered if they didn't sneak in some of their power modifications! But, they weren't on the bill so I know it ain't so. Dang it! should'a done that work long ago. I notice that is "seems" to idle just slightly higher than before. Not hardly much, but maybe it's all in my perception in the totally better sound and feel. -Kevin #4687 24,200 miles