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My 98 dually has factory pipes to dual 40 series Flowmasters ( 2 1/2 in and out) followed by 2 1/2 pipes on out and it's a bellowing beast. On the other hand one of my 72 k10's has 2" pipes to dual 40 series Flowmasters (2 1/4 in and out) with turn downs that I pirated off a mustang gt, and it's a lot quieter. Both truck have headers. I wish that I could get my dually to sound as good as the 72.
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