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The BD Diesel 4-inch aluminized downpipe kit for S400 turbos with a full Marmon 4.2-inch flange is a replacement part originally developed for BD’s Compound Twin Turbo systems. The kit includes turbo V-band and exhaust band clamps and is offered for use with S400 turbos; BD lists the part as modifiable for other applications and backs it with a 12-month warranty.
BD Diesel Turbo Downpipe Kit - S400 4in Aluminized Full Marmon
