just did this on my 2005 4.6L and it sounds great. nice low end rumble but nothing too extreme.

 

I have a 14" Magnafow and it sounds great. Just noticable in normal driving but opens up when you step on it. I did feel better throttle response after I had it installed but I don't think any mileage increase or more power. Also added a Gibson 3" stainless tip that helps deepen the tone. Cut the tailpipe back and adjusted the position until it had a slight "trumpet" effect.

 

Is it the diameter or is it the length of the muffler??

 

Length of the muffler

 

Thanks I'm going to start with replacing muffler first and do the complete CAT back later
I presently installed the Volant CAI. Ill take it from there.

 

does a 2014 f150 magnaflow exhaust fit on a 2007 f150 ???????

 

I love magna-flow. There are different options available. I have them on my 75 F100 428 with headers. Three inch exhaust three chamber magna-flows. I hade some glasspacks on it before and the drone was unbearable. Its sill a little loud but livable on the highway and sounds great when you jump on it.

 

Why not go all the way? Just replace the muffler with a piece of pipe for about $20. The cat converter is already a 'muffler'. I'm only half-serious on this - there may be unintended consequences of increasing exhaust velocity through the converter. Want another cheap trick? Remove the muffler, take a steel spike and knock the baffles out of it. Put it back on.

 

That's what I did. Factory exhaust just without a muffler. I've heard true dual systems with mufflers that were louder than my truck but being an 04 it has 4 cat convertors.