What is the diameter of a stock standard vs commodore's exhaust?

The stock standard exhaust diameter for a typical vehicle varies, but it is usually around 2 to 2.5 inches. In contrast, the exhaust diameter for a Holden Commodore is commonly around 2.5 inches for standard models, with performance variants sometimes featuring larger diameters, such as 3 inches, to enhance exhaust flow and performance. Always check specific model specifications for precise measurements.