I am wanting to replace the stock muffler on my 03 F150 Supercab 5.4 with a Flowmaster Super 40. For those of you who have done this, which one will be the best fit? I'm thinking the #952548 http://www.flowmastermufflers.com/pr...oducts_id=3438 but would like some reassurance from someone with experience before I purchase. Thanks.

 

That will work fine. I like Magnaflow better though.

 

I have been on the fence between the Magnaflow and the Flowmaster (seems to be a common problem around here, lol). I'm just worried that the Magnaflow will be too quiet for me with the factory cats still in place.

 

I would do a 11" or 14" Magnaflow if you a good bit of sound. I'm really happy with mine & the gains I got just from installing a muffler. I had Flows on my last truck and never picked up power or MPG.

 

So you just swapped in a new magnaflow muffler? Not a cat-back system??

 

i just installed a flowmaster super 40 on my 02 f150. it has true duals. it is the dual in dual out muffler. i was running straight pipes but decided to go with flowmaster. i am happy with the sound of the super 40. has a nice deep tone, it is not extremely loud but not quiet at all. has a mild drone at around 1700 rpms, but i like that.

 

deff hear the drone at 1700 but its not to loud. the super 40 outside sounds great when rolling by, you can hear it iver my friends magnaflow on his f250 with 5.8. i say go woth the super 40, i did and dont regret it. it sounds great

 

now i'm even more anxious to install my Super 40, thanks alot