CountryGirl519

I don't want the SOS about Flowmaster saying "they suck, etc." unless yall got actual dyno results or tried it; I hear most people just go with what others say. I hear different things but my dad says go with the Flowmasters since I'm running stock anyways (he had one on his old truck and lasted over 100,000 miles and liked it-sold now) and the muffler shop guys say to go with that too. Then, Magnaflow has the straight through design or whatever but doesn't sound as good everyone SAYS, but does the design really help? Trust me, I've looked everywhere for comparisons- I'm going for sound and gains. I know yall are sick of Flowmaster posts; I am too but I just need a good answer instead of "i heard..."

First off, I got a 2002 ext. cab w/ a 4.8 stock and I want a deep sound w/ not much, if any, resonance. I'm looking at the Flowmaster 40 Series or the Magnaflow. So, if yall got personal experience or dyno results, that will really help. Thanks.

454SuperSport

here's dyno proof for ya, look at post #99: https://www.performancetrucks.net/fo...+truck&page=10

006rcsb

Any flowmaster is going to give you resonance in the cab. Do an 18 to 22 inch long magnaflow no resonance, deep tone, nice wot growl, without being cop catching loud.
I using a 24" case magnaflow and it has a great growl to it at wot, but it's very deep and mellow any other time.

Here is an actual flow comparison chart. The ultra flow ss's are as close as it gets to the same style as a magnaflow.

MODEL (Flow Rate- @ 20.3" H2O) Muffler Inlet Size


+ Edelbrock 5501 492 scfm 2.25"
$ Flowmaster 42440 483 scfm 2.25"
Race Magnum Welded 17216 711 scfm 2.25"

+ Edelbrock 5511 579 scfm 2.50"
$ Flowmaster 42540 352 scfm 2.50"
Ultra-Flo SS 17263 1133 scfm 2.50"
Race Magnum Welded 17218 1000 scfm 2.50"
# Borla 40600 836 scfm 2.50"

+ Edelbrock 5505 708 scfm 3.00"
$ Flowmaster 43040 392 scfm 3.00"
Ultra-Flo SS 17296 2200 scfm 3.00"
Race Magnum Welded 17220 2200 scfm 3.00"
# Borla 40450 1400 scfm 3.00"
# Borla 40575 1100 scfm 3.00"

@ Edelbrock 5535 562 scfm 3.50"
$ Flowmaster 435409 576 scfm 3.50"
Ultra-Flo SS 17268 2200 scfm 3.50"
Race Magnum Welded 17224 2200 scfm 3.50"
# Borla 40615 854 scfm 3.50"

@ Edelbrock 5537 1400 scfm 4.00"
* Flowmaster 54040-10 634 scfm 4.00"
Race Magnum Welded 17225 2600 scfm 4.00"
# Borla 40741 1450 scfm 4.00"

+ Edelbrock General Application Series
@ Edelbrock Victor Series Race
$ Flowmaster 40 Series ( 2 Chamber)
* Flowmaster Delta Force Race Series
# Borla XR-1 Racing Series (Round or Oval)

budhayes3

iTrader: (19)

There used to be a chart on LS1Tech a few years ago that had flow numbers of a bunch of popular mufflers, and no mufflers. I think there was about 15-20 mufflers on there IIRC. Unfortunately I can't find the chart, but I remember that FlowMaster was in the bottom 3, which sucks because I've always liked the way that they sound. If you're looking to squeak every last HP out of your set up, then go for something with a straight through design. If sound is your main concern, then go with whatever you prefer...if you love that Flowmater sound, then go for it

Faze2183

iTrader: (7)

when i switchted from flowmaster delta 50, to my big body magnaflow teh butt dyno felt a inscrease...

also i did magnaflow hi-flow cats at teh same time... i picked up around 1.5mpg and did better at teh track...

006rcsb

here is the chart you were talking about bud

Muffler Flow Testing

All tests via an independent lab
All tests @ 15” wc

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

************************************************** ***************

This test was performed by 5.0 Mustang & Super Fords Magazine, December 2002 issue (page 55) on a '90 Mustang LX coupe with 370hp and 11 second potential. 66 pulls were made for this comparison:

The results in HP order:
1.Flowtech Warlock (open) 374.2 hp/ 333.1 tq
2.Bassani Real Street 373.7 hp/ 333.8 tq
3.Hooker Maxflow 373.5 hp/ 333 tq
4.Borla XS 373.3 hp/ 332.6 tq
5.Magnaflow 372.8 / 332.5 tq
6.MAC 372.3 hp / 331.5 tq
7.Flowtech Afterburner 372.3 hp/ 330.1 tq
8.Hooker Aerochamber 372.1 hp/ 330.4 tq
9.Bassani 372 hp/ 333.5 tq
10.Spintech 371.6 hp/ 332.2 tq
11.Edelbrock Performer RPM 370.9 hp / 331.3 tq
12.Borla XR1 370 hp/ 334 tq
13.Flowtech Terminator 369.5 hp / 331.3 tq
14.Dynomax Ultra Flo 369.4 / 333.2 tq
15.Flowmaster 369.4 hp / 331.8 tq
16.Flowtech Warlock 366.3 hp / 325.3 tq
17.No muffs 365.2 hp / 330.1 tq

Sound Off in Quietest to Loudest (Decibels):
1.Borla XS, 80db at idle, 90db at 2,000 rpm, 110db at WOT.
2.Hooker Maxflow, 80db at idle, 90db at 2,000 rpm, 120db at WOT.
3.Magnaflow, 82db at idle, 91 at 2,000 rpm, 114db at WOT.
4.Flowmaster, 82db at idle, 93 at 2,000 rpm, 115db at WOT.
5.Flowtech Warlock, 83db at idle, 92 at 2,000 rpm, 112db at WOT.
6.Dynomax UltraFlo, 83db at idle, 94 at 2,000 rpm, 113db at WOT.
7.Borla XR1, 83db at idle, 96db at 2,000 rpm, 118db at WOT.
8.Bassani Street, 83db at idle, 96db at 2,000 rpm, 120db at WOT.
9.Edelbrock RPM, 84db at idle, 93db at 2,000 rpm, 118db at WOT.
10.Bassani Real Street, 84db at idle, 96db at 2,000 rpm, MAX. (120+db).
11.Flowtech Afterburner, 86db at idle, 94db at 2,000 rpm, 115db at WOT.
12.Flowtech Terminator, 86db at idle, 94db at 2,000 rpm, 119db at WOT.
13.Hooker Aerochamber, 87db at idle, 94db at 2,000 rpm, 114db at WOT.
14.SpinTech, 87db at idle, 97db at 2,000 rpm, 116db at WOT.
15.MAC, 87db at idle, 98db at 2,000 rpm, 119db at WOT.
16.No Muffler, 91db at idle, 103db at 2,000 rpm, MAX. (120+db).

posted from ls1 tech
https://ls1tech.com/forums/generatio...-mufflers.html

CountryGirl519

Alright, thank you. Looks like I'll be looking back into some Magnaflows. There's many people that say that aren't as loud but it's at least noticeable, right? (Enough to turn heads when taking off?)

006rcsb

if you want a loud one get a shorter one like around a 14" long case

lukesdad04

I lost 21 RWHP with the single flowmaster vs open ypipe on the dyno, however I will keep mine because to me there is nothing else out there that sounds as good as a flowmaster 40 and I can always open the cutout when needed.

silver-mod-o

iTrader: (15)

ever looked at Spintech??? they sound a lot better than flowmaster IMO... theyre still chambered but I think they flow a little better too... get their Pro Street series and it shouldnt be too loud either, they offer complete 3" cat-backs too if Im not mistaken