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Diffuser (thermodynamics) A diffuser is a device for reducing the velocity and increasing the static pressure of a fluid passing through a systemâ. Diffusers are used to slow the fluid's velocity while increasing its static pressure. The fluid's static pressure rise as it passes though a duct is commonly referred to as pressure recovery.
The exhaust gas that collects in the headers moves on to a straight pipe known as a head pipe. The head pipe is the first section of exhaust piping and connects your headers to the rest of your exhaust system. The head pipe is also where you'll find the catalytic converter, the next step in your exhaust system.ufflers. If your exhaust system ended at the catalytic converter, your vehicle would be obnoxiously loud and noisy-far from the high-performance growl you know and love. As their name implies, mufflers reduce the noise coming out of your exhaust to less-than-deafening levels.