An internal combustion engine may be coupled to a two-step engine boosting system to provide desired boost to the engine to meet torque demand. The two-step engine boosting system may first provide boost to the engine by nitrous oxide injection into the engine, followed by switching to providing boost from a frame rail air boosting system to generate the desired boost. Air from an air pump coupled to a transmission of the engine may flow air to the frame rail air boosting system for storage and for subsequent use in providing boost to the engine.