Answer
Aug 28, 2025 - 04:04 PM
A common rule of thumb for exhaust pipe size is to use 1.5 to 2.2 cubic feet per minute (CFM) of exhaust flow per horsepower for optimal performance. For most naturally aspirated engines, a pipe diameter of 1.5 to 2.5 inches is typically sufficient for engines producing up to 200 horsepower, while larger diameters are recommended for higher horsepower or turbocharged engines. It's important to consider backpressure and flow characteristics to maintain engine efficiency and performance.
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