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The stock exhaust pipe size for the 2002 Chevy Silverado is 2 3/4 inches. If you prefer, you can upgrade to a larger aftermarket exhaust pipe. If you decide to overhaul the exhaust system, a larger pipe will be necessary. If not, the original size pipe will function adequately.
The exhaust pipe of the 2002 Chevy Silverado comes stock with a 2 3/4-inch pipe diameter.