What magnaflow muffler is needed for a 04 Screw with the 5.4? Looking to only replace the muffler.

Thanks

 

Good question, I am thinking of doing the exact same.

 

Any 2.5" SISO muffler will do. The smaller the chamber, the louder it will be.

 

What is the build date?

Here are the part numbers for the SI/SO:

before May 31st of 2004 #15821

after June 1st of 2005 #16612

Nevermind, sorry didn't read the entire post. You only want the muffler. APT is correct.

 

i just put a magnaflow cat back system 16614, and it sounds freakin awesome.

 

I replaced the stock muffler with the Magnaflow muffler and kept all stock piping. It sounds awesome, not sure about HP gains ect. I really was only interested in getting a little feedback from throttle , these trucks are to darn quiet. Shop charged me $119.00 installed, took all of 20 minutes. I also put in a K&N drop in filter. I think it sounds great for very little money spent.

 

That's what I want to do. What Magnaflow muffler was it? Is there a lot of noise in the cabin while cruising, or only at acceleration?

 

Thats exactly what I am looking to do. With the JLT CAI and SCT Excal 2 as the only other performance mods.

 

I put a Flowmaster Series 50 in my F-150, and a SUV in the LOML's Expy. Both 5.4s. Mine sounds "healthier" and hers has a nice muted rumble (she did not want to hear it.) Both trucks showed much better passing performance. Not so much noticed around town.

I talked to the Flowmaster guys at a car show, and asked them about single vs. dual and 2.5" vs. 3" pipe. The guy told me to save my money. He told me that, other than using the less-restrictive can, the 5.4 (and 4.6) run better with the factory piping.

Now, if you want noise, that's a "whole 'nother" story.

 

A 5x8x18 will be a nice sound. The smaller the dimensions the louder it will be. Some guys on here have used a 5x8x14, but that's too loud for me. The Magnaflow 5x8x24 isn't much louder than stock.

Do a search for magnaflow sound clips and you'll find plenty.

 

I have the same original question about a new muffler for my 01 Supercab with the 5.4L. Will the recommendation for a SISO 2.5" work for an 01 also? Thanks.

 

I run the maggy 24 ... but I want my truck to be a sleeper .... you can hear the 24 when you get on it

 

I agree w/KDOTengineer "A 5x8x18 will be a nice sound" The p/n 14258 is the the same muffler that I have in my Magnaflow 16616. The sound is just the greatest!!! It has a very nice tone @ start, almost quite @ idle, and loud if you so desire when you get on it!!!

If you go to http://www.performancepeddler.com you can get for $97.02! Use coupon fordf150.net code.

 

Part# 12259, 5x8x18, 3", offset. This is the part suggested from Magnaflow if you dont buy their kit. Just had my 04 FX4 done from the cat back, suuweeeeet!!!

 

I want to do that too. Will i need to buy anything more than the muffler ???