I've read just about every thread in this site but couldn't get a definitive answer. I just put a Flowmaster super 40 si/do exhaust on my 04' F150. I love the sound around town but it does tend to drone @ 1800 rpm. I have a 50 Delta Flow series (si/do) ready to put on but I have doubts. Has anyone else had this problem? Did you replace your 40 with a 50 and wished you didn't?

Thx I'm interested in other opinions

Dee3

 

ive got a 40 and love it i have a deep tone throughout accelaration till bout 40 mph

 

The 40 Was To Loud For Me, Actually To Loud For My Wife, We Use The Truck For Vacation Travel And The 40 Was Way To Loud For Long Distance Driving. I Swapped Out The 40 For The 70 And Is Much Better. Still Sounds Nice And I Got Some Of The Low End Tq And Hp Back.i Have An 05 Lariat Screw 5.4 3v Flowmaster Si/do, Diablo 93tune

 

i have the super 40 on mine i have no drone that i can hear, but my tires do drone and this could be masking the sound i also have a rolled tip that helps with drone, good luck