Quote:
Originally Posted by AleroB888
As the exhaust gas flows toward the back of the car, it cools and its volume decreases, so it might be acceptable to start with 2.5 near the headers, but go to 2.25 further downstream.
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Interesting concept. Essentially 100% of the shops, engine builders, and other performance enthusiasts I've ever talked to or researched are under the impression that if you must use different sizes, increase the diameter as it gets further down the line.