in my opinion the 4" and 5" straight exhausts need a muffler, there is a lot of "wooshing" sound and light throttle but here is my truck with spartan, and exhaust
YouTube - in cab exhaust
YouTube - spartan'd 6.4L at idle and rev'd up
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2008 Ford F-250 CC SB
Dark Pearl Blue(complete repaint under warranty)
6" Stage II Pro Comp Lift
17x9 Pro Comp 7189
37x12.5 BFG M/T KM2's
Spartan/4" duals/AFE
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