On some aircraft you do need to switch the supercharger stages to get best power. The Yaks, Corsairs, Hellcats and several other types require manual supercharger stage switching. The Spitfire IX has a two stage supercharger, however, this is a fully automatic unit so no manual intervention is required... it will switch appropriately (look for a red light on the right side of the cockpit when it switches to the higher altitude stage).
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