Was on my home in the Integra, everything seemed normal for 20 minutes or so.... then the exhaust sounded quiet like it was stock for about 10sec before a stop sign.. took off and it sounded the same until about 100 feet out from the stop sign.. heard a pop and the exhaust note was back... looked in the mirror and there was a faint cloud of smoke. Drove the rest of the way home (about an hr) at 85 no problems.. idled like it always does