charles is right the outlet of the compressor on the small turbo feeds the air intake inlet of the larger turbo and then they go throught the intercooler in one pipe from the bigger turbo. they also use a smaller turbo because when you can only acheive 2000rpm while trying to brake boost it takes the smaller turbo just to spool up the larger one. that why if you watch a diesel race they take so long to stage up





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