2" to 3" exhaust... Worth it?

The best way to get the most torque is with the same size exhaust pipe as the collector for a certain amount of inches, which varies. Engine masters did a thing in that. I don’t want to blanket statement “Use an 18” length of pipe…” At the pipes end, you need a pressure cancellation box or at least as many square inches as the engine is. Then continue with the exhaust pipe into the muffler.