I currently have a set of true dual 2 chamber flowmasters on my 2004 f-150 crew cab 5,4lt. Well I ran over my mothers car yesterday and damaged my exhaust and I was considering swapping my flows for a set of true dual magnaflows. I was wondering how they compared as far as pure oerfiormance gains. I was hopping that I could get some help. Thanks

Blake

 

Right now I am running a Magnaflow SI/DO muffler (12158) that sounds very strong. One thing I did was to remove the cats since they were 111K miles old. I assume you will be using your OEM cats and I don't know how much difference is with the Hi-flow. I know there is. I am super happy with the set up.

I don't have any experience with Flowmasters. I know they sound good. I did own a Gibson Supertruck that I enjoyed a lot but the actual combination sounds deeper.

 

first let me ask, how did you run over your mother's car?

 

magnaflow flows onlt 32CFM more then flowmasters do which means not a noticable performance gain for the price difference

 

Blake,

How do you like the sound of your true dual flowmasters? What does it sound like? I like the flowmaster sound and I'm going to get flowmaster original 40 or super 40 for my '04 f150. I was considering the same setup as you, but flowmaster actually told me that running true duals on my '04 f150 5.4 would cause a loss in power. Did you notice anything, or how exactly did you have yours set up? Did you get it tuned or anything? Have you heard what a super 40 sounds like on the new f150's, and how it compares to the original 40?

 

I really like the sound of the flowmaster on my truck and no I didnt lose anypower. I did get a noticable powergain, but I have heard too many good things about the magna flow not to look into it. Oh and I ran over the car backing out of the frive way not paying atention.

 

Faster, do you have more information about the test results you have posted? I really have a hard time believing some of the results.

 

Blake,

Are you wanting better performance out of a muffler more than good sound? I have heard that the magnaflows are considerably quieter than flowmaster even though they are supposed to flow much better. The magnaflow is good sounding, but only if you put your foot into it, and even then its not the deep growl that flowmaster has. If I were 10 years older, I'd probably buy the magnaflow depending on my preferences, but right now I still like a deep growl instead of a quiet baby growl......and I'm not one of those people that likes the annoying exhaust systems.

 

there was a guy a month ago that found a comparison chart here ill post it.

2 “ Straight Pipe 283 CFM
2 ¼ “ Straight Pipe 365 CFM
2 ½ “ Straight Pipe 521 CFM

2 ¼” Typical Bent tailpipe 268 CFM
2 ½” Typical Bent Tailpipe 417 CFM

2 ¼” Inlet/Outlet_ Glass Pack Tips- No Louvers- Smooth 274 CFM
2 ¼” Inlet/Outlet- Glass Pack Tips-Louvered 133 CFM
Same as above set for reverse flow 141 CFM
2 ¼” Cherry Bomb 239 CFM
2 ½” Cherry Bomb 294 CFM

2 ½” Inlet/Outlet Dynomax Super Turbo 278 CFM
2 ½” Inlet/Outlet Ultraflow Bullet 512 CFM
2 ½” Inlet/Outlet Gibson Superflow 267 CFM
2 ½” Inlet/Outlet Flowmaster ( 2 Chamber) 249 CFM
2 ½” Inlet Outlet Flowmaster ( 3 Chamber) 229 CFM
2 ¼” Inlet/Outlet Thrush CVX 260 CFM
2 ½” Inlet/Outlet Maremount Cherry Bomb 298 CFM
2 ½” Inlet/Outlet Hooker Aero Chamber 324 CFM
2 ½” Inlet/Outlet Hooker Max Flow 521 CFM
2 ½” Inlet/Outlet Borla Turbo 373 CFM
2 1/2" Inlet/Outlet Magnaflow 284 CFM

Standard OEM 2 ¼” Inlet/Outlet 138-152 CFM
Standard OEM 2 ½” Inlet/Outlet 161-197 CFM

 

the magnaflow number shown above is not for the straight thru design. its for their chambered muffler.

 

i just question who did these tests.

 

dont know some company didnt get the name it was posted on a thread of flowmaster vs magnaflow few months ago. u can look for it if u want. i really dont care... my IMCOs flow more then maggies do and their about half the price

 

Me too. I saw the chart earlier, but questioned the results. I didn't even know the used Magnaflow's turbo muffler, for example.

How much are the Imco mufflers?

 

I say keep the flowmasters and then I'll get the magnaflows and then we will see the differance. Your lucky it wasn't your moms SLK 350!!!!

 

i paid 29.95 for my aluminized and the stianless ones are like 49