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Discussion Starter #1
does anyone have the 40 muffler on thier 4.7 L? is it loud? all the time or only when u mash the pedal?
2007 4.7L
 

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I had the 40 Delta flow on a 4.0 XJ, I would not recommend it, even though the sound would be a lot different on a V-8 compared to the I-6.

I am looking at the larger 50 Delta or 50 SUV, smoother sound and more rumble than the 40 series higher toned output.
 

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50 Series SUV

sfd540 said:
i got the 50 suv i love it. sounds great
How would you describe it, can you feel any rumble, or it is a subtle OEM like muffler?

The 40 series I had on the XJ was not only loud, but you could feel it.
 

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I've had the 40 and 50 both on a previous vehicle. With the 50 there was much less "feeling" the exhaust. Interior noise was way down and was a little deeper sounding on the outside. I have not heard the 50SUV, but am thinking about getting either one of those, or a 70 series.

If you look at the flowmasterexhaust.com website they give you charts of the interior/exterior noise by muffler.
 
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