Derringer is the BEST Ford 6.7L inline tuner. Here's why.
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How to Build a Better Inline Diesel Tuner
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Busting RAM Bro Science | Banks Fact Check
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Watch Derringer DESTROY all other Ford 6.7L Tuners 🏁
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WATCH THIS now! | Pusher PowerFlow Intake piping KIT - 6.7 Ford Superduty
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Adding 120 HP to a 20 year-old Diesel
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1,004 HP !!! Killing A Duramax Pt 15
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More POWER With A DPF Fitted? | Gale Banks On Emissions [TECH TALK]
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