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MBRP vs Flowmaster for a Ford F-250 with the 7.3L Power Stroke: for this diesel, MBRP is the one that sells complete turbo-back kits, while Flowmaster is best known for chambered mufflers and sells a 4-inch downpipe for the same trucks. So the two brands are less direct rivals than they look. This guide explains what each one actually offers for a 1999 to 2003 F-250 or F-350 Super Duty, how the sound compares, and which fits your goal. The short …