Magnaflow vs. Flowmaster
Fleet Mechanic
Joined: Apr 2007
Posts: 1,433
Likes: 7
From: NH
I went with just the SI/SO 3" Magnaflow on my 5.4l. It's a step up but not annoying. No in cab resonance. It has a nice cruise tone at 1500-2200 under load. Wanted to keep the system all Stainless.
Was originally looking at the Flowmaster 50 series SUV.
Was originally looking at the Flowmaster 50 series SUV.
Senior User
Joined: Jan 2010
Posts: 430
Likes: 0
From: Florida
I have original 40's Flowmasters on my big chevy. It has 12" lift kit so the interior resonance isn't that bad and it dumps before the rear axle. Has a 2.5" custom built with an X-pipe. Sounds pretty gnarly!! I love that Flowmaster sound. I guess it is what ever you prefer. 
Freshman User
Joined: Dec 2009
Posts: 43
Likes: 0
From: bangor pa
I have a 2004 f250 5.4 and i just replaced my stock muffler with a flowmaster 50 series and I could not be happier. There is a rumble around 1500 rpm but after that it quiets down quite a bit in the cab. Outside there is a noticeable increase in sound but it is throaty and not obnoxious. I use my truck at work so I wasn't looking for a very loud exhaust but I am happy with the more aggressive tone I got from the flowmaster.
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Posting Guru
Joined: Dec 2001
Posts: 2,017
Likes: 2
From: Southeast FLA
It's funny, but a lot of guys completely forget about Dynomax mufflers despite them giving the low tonal quality and sound that a lot of people like.
I've never been a fan of Flowmaster's sound(s).
I've never been a fan of Flowmaster's sound(s).
New User
Joined: Jan 2014
Posts: 19
Likes: 4
I have an '08 F250 4X4 with the 5.4L. The time has come to replace the muffler as there is now a small hole (approx the size of a dime) and a 1 1'2" crack along the side seam at the back of the muffler. I would like to go with either a Flowmaster or Magnaflow but the DW doesn't want it loud in the cab. Especially when giving it gas towing our TT up a hill. The closer to stock sound the better for her. A deep mellow sound is ideal for me. Has anyone replaced their muffler with something that isn't going to be defining in the truck? Any advice is appreciated.
Fleet Mechanic
Joined: Sep 2007
Posts: 1,256
Likes: 6
From: Garden Valley, Idaho
I have dual Magnaflows on the wife's 2007 Lincoln LT 5.4 and a single on my 2008 V-10. Love them both.
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Former Vendor
Joined: Apr 2014
Posts: 156
Likes: 0
From: Santa Rosa, CA
Former Vendor
Joined: Apr 2014
Posts: 156
Likes: 0
From: Santa Rosa, CA
No problem. I always recommend that people call in and speak with one of our customer service representatives, prior to purchase, to find out which part number will best fit their needs and budget. Good luck!
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Big_Red_Brute
1987 - 1996 F150 & Larger F-Series Trucks
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Sep 11, 2014 03:16 PM
