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I finished insatalling the Flowmaster cat back system I got off Craigslist yesterday, it is a 3" single exhaust system and it fits perfectly and sounds really nice. Not too loud, but it has a nice tone to it. The old exhaust on my truck was on it's last legs. Every clamp was rusted away, and 3 of the 4 rubber hangers were shot. The rubber parts were fine but the metal rods that are welded to the pipes had broken away. The installation wasn't hard at all, the only difficult part was getting the old pipe separated from the catalytic converter. That took a while and a fair amount of PB Blaster. But all in all, not too hard a project, and definately worth the $40 I spent on it.