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Another thought, guys setting up Cummins go to the larger size turbos because when fuel rate is set up way over stock along with other modifications, the exhaust volume spins the smaller turbos so fast the compressor side can throw blades through the housing. There are photos of this happening...

We have interchanged the turbos regardless of truck size, and we prefer the smaller whistler turbo. I have read the larger turbo on LDT motors was added to clean up smoke (T stood for turbocharged). The smaller whistler turbo (whistles because it spins faster) on the LDS (S for supercharged)...