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I have an 05 and first deleted the cat and ran an MBRP exhaust with muffler, then later I got the MBRP muffler delete and think the exhaust is much louder and sounds like a jet engine running at idle. As for performance and mpg there will be no change. I also have the Accufab intake elbow and didn't really feel much difference but diesel power mag dynoed this unit and got a 10hp and 20 ft/lb torque increase.
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2005 F250 XLT SC, SB, 4x4, 6.0L, FX-4, TorqShift, MBRP 4" straight piped w/5" MBRP tip, Dark Metallic Stone, stock 17" wheels, 4" Superlift w/Bilstein 5100s, 35" Toyo MT's, Superlift Xtreme-ring, Line-X, Accufab Elbow, ZooDad by Predator, SCT with Tow Agg, Street and X-Street from Eric @ Innovative, N-Fab steps, Recon LED tail, 3rd brake and interior lighting, badges by Billet Badges, PIAA lighting
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