How much horsepower did you get with 2 flowmaster 40's?

Seraphitia102

will post boobie pics for a supercharger

Oct 11, 2004

737

1

16

California

Nov 25, 2004

#1

• Nov 25, 2004

• #1

I just got my Mustang GT welded in with 2 Flowmaster 40's street muffler. Does anyone know how much flywheel and rear wheel horsepower does 2 Flowmaster 40's mufflers add on the stock H-pipe (if any horsepower at all?)

 

GT2000JAY

Founding Member

Oct 22, 2002

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Northwest

Nov 25, 2004

#2

• Nov 25, 2004

• #2

You won't really pick up anything with weld-in Flows.

1. The stock H pipe is the biggest restriction
2. The pipe diameter on the catback is the same with weld in mufflers.

It will sound faster, though.

Jay

 

P

Pitch Black

New Member

Jul 17, 2004

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TX

Nov 25, 2004

#3

• Nov 25, 2004

• #3

Maybe 3rwhp on a good day

 

X

XStanger

Founding Member

Sep 1, 2002

383

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Nov 25, 2004

#4

• Nov 25, 2004

• #4

Sounds like 15hp, really not enough to even feel.

 

RysRed96GT

I like it FURRY!!!

Founding Member

Apr 9, 2001

3,207

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56

Pasadena, MD

Nov 25, 2004

#5

• Nov 25, 2004

• #5

0.45 hp

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,259

17,943

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Massachusetts

Nov 25, 2004

#6

• Nov 25, 2004

• #6

0 HP

But it sounds bad-ass

 

Fast02

New Member

Sep 29, 2004

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Nov 25, 2004

#7

• Nov 25, 2004

• #7

You wont lose any horsepower and will gain street cred.

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,259

17,943

224

Massachusetts

Nov 25, 2004

#8

• Nov 25, 2004

• #8

Yup, any stang with any exhaust sounds bad-ass on the street. Intimidation factor is worth 20-25HP alone!

 

C

codyGT

New Member

Apr 11, 2004

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Nebraska

Nov 25, 2004

#9

• Nov 25, 2004

• #9

I think the only time you will really free up any power is with a strait through type muffler. Flowmasters onlt flow slightly better than a stock muffler.

 

myponyrocks

I have more billet on the Stang than most women ha

Apr 18, 2004

1,219

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37

Nov 25, 2004

#10

• Nov 25, 2004

• #10

I thought flows added a small ammount of torque too? And also even though the HP gains are minimal, they are more consistant through out the whole band?

 

Seraphitia102

will post boobie pics for a supercharger

Oct 11, 2004

737

1

16

California

Nov 25, 2004

#11

• Nov 25, 2004

• #11

thanks folks! So in other words, I'm not gettin jack for horsepower, it's practically all show, no go right?

Thanks cool though, at least I sound bad ass

 

D

Darkhorse845

Banned

Nov 17, 2004

101

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0

Las Vegas,Nevada

Nov 25, 2004

#12

• Nov 25, 2004

• #12

2 or 3 RWHP

 

crew_dawg16

New Member

Apr 25, 2004

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DeKalb, IL

Nov 25, 2004

#13

• Nov 25, 2004

• #13

i would go with a non-baffled, straight-through muffler like magnaflow has. You can actually look through the muffler and there is less restriction this way. They aren't as loud as flows, but have a more refined sound, especially with an o/r X pipe

 

Wayne S

Founding Member

Aug 2, 2002

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Warwick RI

Nov 25, 2004

#14

• Nov 25, 2004

• #14

Mustang5L5 said:

Yup, any stang with any exhaust sounds bad-ass on the street. Intimidation factor is worth 20-25HP alone!

Click to expand...

my mufflers are still stock

 

merc123

Active Member

Jan 27, 2003

420

2

39

North GA

Nov 25, 2004

#15

• Nov 25, 2004

• #15

What about flows with an o/r h-pipe?

 

Seraphitia102

will post boobie pics for a supercharger

Oct 11, 2004

737

1

16

California

Nov 25, 2004

#16

• Nov 25, 2004

• #16

i got flowmaster 40's clearly for the sound, but if i can get extra horsepower, than that's even better

 

nhra427

New Member

Oct 22, 2004

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Oregon

Nov 26, 2004

#17

• Nov 26, 2004

• #17

I think the flows will help with a o/r h pipe. i think all the power loss would be with all those cats and the flows will help when the cats are gone or with hi flow cats

 

tomustang

Psychotic Member

Founding Member

Jun 8, 2000

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McLean Hospital

Nov 26, 2004

#18

• Nov 26, 2004

• #18

myponyrocks said:

I thought flows added a small ammount of torque too? And also even though the HP gains are minimal, they are more consistant through out the whole band?

Click to expand...

.46tq

 

CManT1914

New Member

Feb 5, 2004

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Killeen, Texas

Nov 26, 2004

#19

• Nov 26, 2004

• #19

I'm gonna jump in and say none also. I got mine in a long time ago and didn't notice ANY difference, except in the sound. When I did my o/r h-pipe though, that's a whole other story. It REALLY helped, I dropped .35 seconds off my 1/4 ET with it. When I did my dumps, no HP gain, but holy CRAP does it sound scary now. I set off car alarms all the time, and scare small children and animals. It's great.

 

1low03gt

20+ Year Stangneter

May 24, 2004

708

11

38

Cold Hell,Ontario,Canada!!

Nov 26, 2004

#20

• Nov 26, 2004

• #20

Almost all cat back exhaust,or weld in mufflers give little to none in hp.If you add an aftermarket h pipie/x pipe,then you will maybe gain a "few" hp out of the mufflers,other then that,they are for pure enjoyment of sound,and intimadation.