Flowmaster 40 and mpg

[Hockster]

Go roush, you won't be disappointed!

Loud outside, just right inside, quiet enough to hold a conversation, not affect phone calls, and not get annoying, loud enough to know the exhaust is there, and zero drone.

Did you leave the resonator on the truck?

 

[Reptar]

no the roush is a full catback, so it deletes the resonator and muffler and is straight pipe with a single straight-through design roush muffler.

 

[MotuMute]

I have that same set up on my 6.2L. I took out the resonator and put in the 44 (basically exactly the same as the 40) with single in and dual out. I haven't seen any noticeable mpg changes expect for the fact that I slam on the gas to hear that baby purr. Also I have no drone until I hit 75-80. Then if I'm on the phone the caller usually tells me they can hear some background noise. But other than over 75 I don't really have a problem with drone

Yup! Same here. Not bad even with turndowns. My mileage goes down with in-town driving because a lot of it is in Haul "Ass" mode... that and downshifting under bridges for that beastly sound that turns heads, and downshifting at red lights... and stop signs... and yield signs... and...

 

[Big Blue]

Simple answer. It's sounds much better so your on the gas more which = lower mpg.

Dave

X2!