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You want the size of the existing pipe, or the best size to run? I can't answer either question, but (may want to post in diesel truck forum here) best to measure what is there now.
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'95 F150 XL, 2wd, 300 I6, 5 speed, 3.08 gear, 157,000+ miles, Flowtech Raptor muffler, driven hard for fun!
'92 Aerostar 3.0 Vulcan V6, auto, 127,000+ miles, Dynomax Super Turbo muffler
www.HonestEdu.org
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