Apply anti-seize compound to the slip joints and clamps. This makes future removal (for clutch jobs or differential service) dramatically easier.
The stock exhaust on a modern sedan weighs between 45 and 60 pounds due to massive silencers and heat shields. The weighs approximately 22 pounds (including all clamps and hardware). That is a weight reduction of roughly 25–35 pounds from the very rear of the vehicle—unsprung weight reduction that improves rear axle response. Xtm Avengers Main 1.8