Who has 40 series flowmasters? Whose runnin them out the back? Is it loud in the cab at 70mph? Do you wish you would have gotten the 50-70 series instead. I want a pretty low growl but don't want alot of noise in the cab when cruisin. Please Help!!

 

I have a single inlet/dual outlet, 2 chamber Flowmaster 40 series with the exhaust run out the back (not true duals). It has good rumble on idle and during acceleration. You can hear it at cruise speed if you pay attention but it is not loud or annoying. The radio at normal volume covers it. Personally I'd have liked a little more sound. With the stock muffler and the radio on sometimes I wasn't sure if the motor was running or not.

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2001 SuperCrew XLT, 5.4L, 4WD, ORP, TT, Toreador Red

 

Thanks screwin around, i really appreciate your input. So it's not real loud in the cab at 70, huh? Good, i don't like alot of racquet in the cab especially when your trying to carry a conversation.

 

I have the 40 delta series muffler (replaced stock) and it is not loud at all. Has a nice grumble when starting and then idle is barely noticable. Not loud in cab at 70mph either.

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2001 F150 SuperCrew XLT
White 4x4 5.4L V8 3.55LS
Class III Tow Pkg
Slid Plates
Sliding rear window
Bed Extender
Mods:::::::::::::::::::::
Huskey Liners
Westin Steps-Black
BFG AT KO's 285/75/16
AirForce 1 FIPK
FlowMaster 40 Delta series muffler
BedRug
ARE Z series cap

 

I just put on the FM 50's with duals out the back, today. I think at this time that I would have done a delta 40 if I knew then what I hear now. sounds good at idle and accelerating but, to quiet at driving speed. But, I was being cautious as my mother sits in the rear left seat. lol

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01' screw XLT
highland green
5.4
moonroof, 6CD changer
foglight switch mod
17" wheels
bedliner, bedcage
K&N FIPK
Extang Tonneau
Flowmaster 50 series
rear dual pipes

 

I too have the Flowmaster 50 Delta Flow SI DO with chrome tips out the back. I would agree, not very agressive. Had I been able to listen to the 40 before I made my decision I would have gone with it.

I'm not sure if it is the 50 or the Delta Flow but there is no droan at any speed. I like that. I had a two-chamber - can't remember the brand - that had a pretty loud droan at 45 mph.

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Supercrew 4x4 Lariat
Solid Black , 5.4 Triton, 3.55 Limited Slip, 6750# GVWR Package, Skid Plates, Moon Roof, Sliding Rear Window, Trailer Tow - Class III, Cargo Cage, Grey Leather Captains Chairs, 6-Disc CD Changer

Mods:
305/70/16 Goodyear ATS
American Racing Atlas 16x8
Chrome Westin Steps
Flowmaster, Delta Flow 50 SI/DO
Cranked Torsion Bars 1"
Mobil 1 @ 1,000 miles
Concept II Deflecta Shield

Planned:
Toneau Cover
Expedition Console Mod. (Been there, done that - didn't like it so I sent it back!)

Another great Ford truck site -www.fseries.com

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