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So, I was driving around town the other day, windows down, arm out the window (god i missed having an automatic), and i was cruising along at the standard city speed, and noticed, my truck sounds like a friggin tank! doing 50km/h, it was only doing 1000rpm. anybody elses do this? i like it personally, I just dont understand how its doing it though, because the exhaust is all stock.
 

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Your exhaust piping may have a crack or leak somewhere before the muffler..and it may be somewhere you can't readily see. Recommend that you inspect and carefully feel for damage
 

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Are you still having this problem? It sounds like a possible exhaust leak. My 2.8l had this problem and it sounded similar to a tank or tractor. The bolts that secure the exhaust manifold are prone to breaking, this makes for one noisy leak. I had 3 bolts broken on my drivers side. Got it fixed and now it sounds like a charm.
 
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