I have a 2005 F150 Lariat with a 5.4, i am currently running a 3 in y pipe back into a flowmaster 10 series dumped under the bed. I have been wanting to change the muffler to something different. I like the sound at idle, but under throttle its too raspy. I was wonder about how a magnaflow would sound in place of it or what muffler you would recommend? I want something that sounds good at idle and has a nice tone under throttle with no drone without replacing the whole exhaust.
The second truck is a freshly ordered 2011 Supercrew with a 5.0 that I ordered for my wife. I am trying to find a mellow sounding exhaust that has a calm tone at idle but sound good at w.o.t. I am looking to keep a single 3 in y pipe back exhaust on both trucks. I have run flowmasters for a long time, but i really am unhappy with the sound on my 5.4, so i think its time to try something new. I am leaning towards a magnaflow because it sounded fairly quiet at idle and had a nice w.o.t sound, but what size muffler body is recommended or oval vs the round body?

 

Borla Pro XS for both of them!

 

I put a 4x9x14 si/so oval body Magnaflow on a 05 on Friday and put the same but si/do on a 2010 about a month ago. That is the muffler I would recommend.

 

Borla/Roush for both. Are you saying your running a 3" "Cat back System" with a Flowmaster ? I believe that's what you mean. (?). Yea, off that Flowbastid for better sound and performance and hurry, -your robbing yourself of more than you probably realize lol.

Those 2011's are pretty incredible. I can't believe their making 90% percent of their torque @around 1700 RPM's. You can go from a 3 speed tranny to a 5 or 6 speed in the cab and on the fly. New ones are very sweet, - might as well sound that way ehh..

 

The 05's exhaust was done at a muffler shop a couple years ago and i had them run a 3 in pipe from the y back into the flowmaster and then dumped it before the axle

 

i think the oval body is a good idea for my wife's 2011. Does anyone have experience with running a magnapack? how do they sound at idle vs the oval body? under throttle? i am trying to get a muscle sound out of the 05. I have it lowered, running an AFE intake, BBK Throttle Body, SUperchip FlashPak. I plan on adding cams and a custom tune in the future, i guess i should have added that earlier

 

Oval has a very quiet warm idle, round will be heard some. round body will be louder in every way basically.