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[Retort]

Had to replace my exhaust system on my box stock 2500 Dodge diesel. Summit supports our banquet so I bought the replacement parts from them. Anyhow I put a Dynomax 17220 muffler, & SUM638230 resonator on it, and picked up 2.5 MPG.  Hope this helps someone out

[team97racing]

5.9 or 6.7

[Retort]

5.9  24v, 5 speed, 3" exhaust   140,000mi