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The motor is a 96, tell me more about the double layer valve covers. I have had the covers off of my motor and my frinds 97 and noticed no difference. I dont know if his 97 has the split shots but it is hard to tell its even a diesel. His truck sounds more like a new Duramax its so quiet. I even installed rubber sheilds inside the wheel wells by the shocks to try and help keep some of the noise inside the engine compartment.
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