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Anyone install Mufflex on 6.4?

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37K views 51 replies 27 participants last post by  blackfoot80  
#3 ·
I have been looking at Mufflex as well , I am just worried about what it sounds like when it shuts down 4 cylinders . I have heard that the Chevys sound like a rice burner when in the Eco mode , but it can't sound much worse than the whistling , chirping that my 6.4 does now when it goes into Eco mode.
 
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