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In a stack, the second core works with air the first one has already heated and slowed. This looks at how order assigns the penalty, why a gap needs a sealed perimeter, and why the exit sets the pressure difference the front end runs on.

An intake runner is a tuned length with mass and spring behind it. This explains the two models that describe it, why a length change rotates the torque curve instead of lifting it, and how hose compliance and housing volume retune the pipe.

The collector is a wave junction that decides how much of each pulse leaves and how much returns up the primary. This piece covers merge angle, firing-order pairing, diffuser recovery and what changes when a turbine replaces the open cone downstream.

Back pressure is a reading taken at a plane with a damped instrument, not an attribute of a pipe. This separates mean restriction from wave timing, why a larger system can cost torque, and why a tailpipe gauge describes the wrong end of the car.

Straightening works by shrinking the long side, and the shrink happens on cooling. What spot and wedge heating do, and why titanium and heat treated aluminium refuse the method.

A weldment has a stack-up term that never appears on the drawing. How shrinkage, sequence and datum choice move the error, and where tolerance is worth spending.

A cone is a flat pattern before it is a shape, and the blank is not a trapezium. How a frustum unfolds, why cone rolling differs from cylinder rolling, and what the seam decides.

Stainless fails a drill for two reasons that feed each other. Why rubbing rather than cutting starts work hardening, and what feed, point geometry and coolant change.