I put a flowmaster 40 series on my 05 5.4 3V before I had a 100 miles on it and long before I knew about this website. I see a lot of folks think the magnaflow is the bomb for this truck. I rarely drive at WOT. Would it be worth the bucks for me to go back and get the flowmaster replaced with a magnaflow or should I juast stick with what I got?

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Sorry I posted an aftermarket question in the OEM forum you would think with over 60 posts I could get it right.

 

first off, I don't have a new generation 5.4 like you do.

I have a 2001 4.6L

However, I have had both flowmaster and Dynomax on cars and trucks in the past. It has always been my opinion that Flowmaster is louder than Dynomax (generally), and I have personally liked the tone of Flowmaster better.

If I were you, and if you want your truck to be the loudest on the block, then put an IMCO Extreme muffler on your truck and ditch the flowmaster.

I've got on ordered for my truck, will be here next week.

Check out www.grabthepower.com and listen to a sound clip of an IMCO muffler on a 5.4L...you will be hooked!!!

 

Keep the Flowmasters unless you have the money for Magnaflow. I like both exhaust systems but I like Magnaflow better.

 

I agree.
Magnaflow (to me anyway) is the best of both worlds.
Sounds great, no drone, not overbearing, great warranty.

 

You can't beat Flowmaster. Better price, better sound. SOme will quibble over performance, but a simple muffler isn't going to have more than a 2 or 3 HP difference in the long run, and you''ll never notice it.

 

Thanks for the replys. I am not looking for the loudest muffler I can get. I am more interested in the power difference. I have heard that the flowmaster actually hurts bottom end and that is one place I don't want to give up any HP but if it is not that big of a diffenrence I don't want to drop another $100-$125 into my exhaust. I rather put that money into my tuner kitty.

 

i have no dyno sheets to prove this but in my opinion the flowmaster will give you more on the low end 700-3000 rpm than the magnaflow due to it having more backpresure wich aids in exaust scaviging and is better on the low end than the straght threw design of the magnaflow, the magna flow will do better on the top end because there will be less backpressure, get it? keep the flowmaster in my opinion

 

I think it is a toss up. I think Flowmaster has the lead in the sound department and Magnaflow has it in the looks. You pick what matters to you. Flow is a lot cheaper. I went with Flow and dont c changing.

 

Flow is cheaper because it is NOT stainless.
In this case you get what you pay for.

If you don't mind changing systems out every two years or so, flow is the way to go.

This applies to the northern climates, I imagine they would last longer in a salt free enviroment.

I found the magnaflow tone very pleasing, it sounds like a truck, not like a vehicle without a exhaust system.

Lets face it, if you are tooling around in a 30000 plus truck, you don't want it to sound like you can't afford a muffler.

The magnaflow gives a deep throaty growl, which to me has a high end, high performance sound to it.

If loud is all you are looking for, save your money and ditch the muufler period.

 

BLYOTH, I just went through this Flowmaster vs. Magnaflow problem myself. I bought my 03 4.6L Screw with a custom cat back SIDO 50 series exhaust system with a rear exit that the previous owner had installed.

About a week ago someone decided to turn my dual into a single out system by cracking off one of the exits. I took it to the local muffler shop and they sugested I replace the system because of rust, broken hangers, and question able welds sondecided to replace the whole system while I'm at it. I chose the Magnaflow 15749 to try something different + it was cheaper than getting a custom fab.

So whats the difference between the two exhaust systems on the same truck? With the MagnaFlow setup my woke up my truck since the throttle response is now crisp, the auto tranny shifts much smoother, the power band feels more liner than the Flowmaster setup, and the motor doesn't labor to its shift points. Sound wise my truck is louder than the 50series flow master but that may be because of the 18" MagnaFlow and the fact I have the system exit out the side behind the rear wheel vs. out the back (Flowmaster). My wife did comment that the Magnaflow system sounds much deeper and cleaner than my old system. IMHO the MagnaFlow system just works better with my truck than the Flowmaster.

 

Flowmaster offers a stainless line of mufflers if you really want that super expensive metal under your truck where no one will see it. I don't have any northern experience on exhaust, however, my last mustang had a flowmaster system on it for 5 years and wasn't even surface rusted when I sold it. If you go offroad and cake mud and other shiat up on it, then yeah, its gonna rust fast without cleaning. But if you keep it clean you'll never have a problemm, you'll save money by the gobs, and you'll enjoy the real sound and performance of a Flowmaster system

 

Muffler ONLY no pipes.
Like I said before you get what you pay for, If your happy with flow great, some have different opinions about quality.

My engine can't be seen either, but I still put on the best components available.

just because the exhaust system cannot be seen is no reason to install sub standard components.

In the end you do get what you paid for.....

I am NOT implying Flow is substandard, many use it, many like it, I would not use it as I do not feel it is the best available for the money.

If you are modding a expensive vehicle, saving money should never be the first concern.

 

So what you're saying is that all automotive companies for the last 100 years have used substandard equipment on every car produced? I mean, no one used stainless up until just a few years back. So shall we sue them all for the sub-par equipment that have been crapping on us with for 100 years? Thats the most acenine thing I have ever heard. Sub standard my @$$


When I sell a car, 95% of the time people look at the engine. Maybe 2% of the time they get on the ground and crawl underneath to look at exhaust and underbody. My engine can be and is seen on a frequent basis.

My Navi brand new was $47K. I am concerned about saving money at every corner, and I bet 99% of those who mod their vehicles are as well. Then there are the 1% who can afford whatever they want and cost is no issue.

This is not meant to be a deameaning, degrading retaliation, but an education as to what the rest of us think. I don't call 100 years of successful use substandard on anything. I make plenty of money but I try to save at every corner, including my used supercharger. I don't buy brand names, I buy knock off ebay parts, they are just as good. I don't pay anyone to do anything I know I can do. I like my money right where it is, in my pocket. I should assume everyone else does too. I see no reason whatsoever for anyone to spend $500 or more on a catback system. If you want stainless that bad, leave the stock pipe and buy a new muffler. The navi had 2.5 inch on it stock stainless. Its in the junk pile and regular old exhaust pipe took its place. Been on there 6 months or so with not even the slightest hint of rust. I don't see how you'd think that in 2 years I'd have to replace it. If you really want top dollar ultra exhaust, then you buy Borla. Borla is the high dollar king. Magnaflow is just somewhere in the pack

 

Bottom line is it is all up to your personal preference.

At least we can all agree that Ford is way better than Dodge or Chevy!

 

Yep, no one used stainless until a few years back.
Every one also rode HORSES until a few years back.
I find your personal attack insulting to say the least and will no longer respond to your posts.

Amazing that your need to feel validated with your choice requires insulting other posters that disagree with you.

So you win, whatever you have is the best, hands down.

Now maybe the discussion can return to a adult level, something that for but a few make this board great!!!