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Originally Posted by maddog
Makes perfect sense. Theory is that as the gas cools it contracts, from diff back this causes the gas to slow. Reducing from 3" to 2.5" at the diff keeps the velocity and improves torque.
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I'm sorry but you can't break the laws of thermodynamics just because you own a wrx
You are just increasing the back pressure by going to 2.5" and an engine obviously likes a certain balanced amount of this.