On engines with enhanced fuel flow and larger turbochargers, the principal remains the same. Velocity and temperatures are needed to drive the turbine wheel which turns the larger compressor wheel that supplies the extra volume to attain proper air-to-fuel ratios.
BDs 1-Piece Stainless Exhaust Manifolds do not require the expansion joints because of the ability of the Stainless Steel to withstand higher heat without cracking.