So, I have a 2006 F-150 XLT 5.4L.

Pretty much stock besides my SI/DO knock off flow master complete with crooked tips and all.

I am tired of my tips sitting crooked with the truck and each other, so I want to replace this with something else.

Now I got under the truck and I, to be honest have no clue if the truck has had the cats messed with before I got it.

Here is my description of what I saw.

It comes off the factory headers and into a flange, then a O2 sensor, about about 3-4" of pipe there is a small round converter, if I didn't know better and had not seen the O2 sticking out of it, I would have thought it a resonator.

Then the Y pipe and into the SI/DO muffler and on from there.

Here is what I want, a louder and deeper note/tone yet not so loud that it gets annoying on my daily 30 mile one way drive. And not so costly as to break the bank.

Here is some things I thought about doing.

First and least costly option, do nothing besides cut my tips off my self and fix them back some other way.

Second and next to least costly, swap to a SI/SO oval body muffler and go from there.

Third option, find a similar SI/DO and re do the pipe from there back.

Fourth and likely costly,
Starting at the converter(s) running a 3" pipe into a 3"Y and then a 3" SI/SO oval muffler, was thinking maggie?
Y it out the back (not so keen on this), or maybe just dump it before the rear tire (passenger side) double tipped. ( kinda like this idea)

Or is that too much exhaust pipe and not enough truck?
I was thinking a singe 3" would not be too much because I see a lot of people here have dual 2.25" and 2.5" both would flow more than a single 3" right?

Last but not least, save for a complete true dual exhaust, but I really am not sure thats what I want.

I really want a louder and deeper tone but not so much louder that its annoying and over my speakers.

Right now you can just barley hear the truck running at highway speeds with no radio on, and when at idle stopped its very mild in cab.
When you step on it all you can hear is the CAI making noise.

I very seldom tow anything.

Thoughts?

 

Too much reading.

 

2006-small round converter,,,probably hasnt had converter work,

go with a 3" bullet or a 3" magnapack


and do the tips however you want

 

Run a 3" single exhaust since you like the idea, with a 14" oval body Magnaflow muffler. Sounds as if your cats are stock. The O2s would be ontop of the cats so that makes difficulty seeing them.

.....

Please view this fail image.
http://theinsanityreport.com/home/wp.../02/bbnf4B.jpg

 

^ HA HA Give me a break man, I have done some drinking last night.

 

I think thats what I will do, hopefully it will sound good and not hurt the way the truck runs.

i remember seeing or hearing about the flow of dual pipes VS a single pipe but I can't remember where it was and what they said.

Would I be able to buy a pre-made 3" Y or would it have to be made? and I was thinking of going with larger (or at least high flow) cats, figure if I am going to do it, I might as well do it right.

I figure a single 3" with high flow converters would not hurt my bottom end, I doubt it would effect me any at all, besides sound.

I really like the idea and I hope that it will be louder than what i have now.

 

I found this on a different ford web page.

http://www.fordforums.com/f648/singl...xhaust-135371/


Freshmeat
exhaust pipe single vs dual

I was hoping you wouldn't get into that. Because, yes- it involves physics.
Here we go...
The surface area of a 2.25" pipe is effectively 3.9760782021996".
The surface area of a 2.5" pipe is effectively 4.9087385212341".
The surface area of a 2.75" pipe is effectively 5.9395736106932".
The surface area of a 3" pipe is effectively 7.068583470577".
It's better to deal with surface area than diameter, for several reasons. It gives a better idea of how much the gases are capable of expanding ******d.There's a significant difference between the 2.5" and 3" sizes. If you run a single 3", you'll be better off than running two 2.5" pipes (7.068583" of surface area as opposed to 9.817478" [almost a full 3" of surface area]), unless you're looking for the horsepower.

So- bottom line, if you're going to run either single 3" or dual 2.5", go with the single 3". You'll produce significantly better bottom end torque than with the duals. In fact, most of the local Mustang guys I know are ditching their dual set-ups for single 3".

Do the hard numbers help you any more in making your decision?

 

Parts list?

besides the Y pipe.

#94109 x2
35107 (tip)
12619 X1

Unless running a new Y pipe at 3" and new 3" converters is a bad idea, I kinda like it.

Not figured out if it would be best to try and put new pipe from the header back and place a bung in the pipe where the O2 is in front of the cat or not.

Wonder what it would sound like.
It should hopefully be louder than my current setup, but not crazy loud, moving the tip to in front of the wheel and not behind it should help the in cabin sound.

Still not made up my mind, but I may just end up stepping the stock Y pipe to a 3" and then the muffler,
Just going to look around and read and learn.

 

Dual 2.25" is damn close to the same "surface area", and it will sound better. I also wouldn't say a "significant" difference. You will feel a little loss with dual 2.5" when pulling, but that is about it. I have never heard of ANY mustang guy running a single 3".