Do Flowmasters hurt performance?

M.P. Cobra Fan

New Member

Aug 10, 2007

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Atlanta GA

Dec 4, 2007

#21

• Dec 4, 2007

• #21

I have checked for exhasut leaks I have none. Now mine do not sound like what is being described above. Maybe we are all thinking something different but describing it the same? I know what an exhaust leak sounds like, and what to look for. I do not have one.

Like I said, I have had many many cars over the past 16 years. Almost all of them have had after market exhaust of some sort. All of them made some sort of popping upon slowing from higher RPM.

 

DropTopPony

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#22

• Dec 4, 2007

• #22

I don't know if Flows rob power but they aren't the best flowing muffler. I have seen several cars pick up 5-15 rwhp just by switching out the Flows for a set of Borlas or Spintechs etc...but these were all 400+ rwhp cars.

 

lazerred02

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Nov 19, 2004

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FT Stewart, GA

Dec 4, 2007

#23

• Dec 4, 2007

• #23

04GTMustang said:

my guess would be if other peoples flows are not popping u might have an exhaust leak somewhere. I know ive got a leak somewhere with my exhaust i think its where my xpipe connects to the manifold. but i have a sort of rattle sound around 2k and under when im hitting the gas. its not a ping type rattle. and it pops on decel but im pretty sure all borlas pop a good bit on decel lol.

i would check everything again something may not be lined up properly and ur just not seeing it.

Click to expand...

I know for a fact I don't have any exhaust leaks at all. I don't necessarily think that the sound around 2k is coming from the exhaust, but it could be. Maybe a Cat is coming apart internally

 

BurningRubber

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Dec 6, 2004

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Dec 4, 2007

#24

• Dec 4, 2007

• #24

When the exhaust is cold (or warm, just not hot) tap your fist or hand against the converters and see if they rattle. If so they are breaking up inside.

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

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Dec 4, 2007

#25

• Dec 4, 2007

• #25

SVT32VDOHC said:

I didn't have any popping at all with my Flowmasters. I have had 11 or 12 Mustangs, most having flows, never had popping.

Click to expand...

+1


Both my cars have flow and no popping


When i had MAC on my 5.0, it used to pop when i let off the gas.

 

Mossberg

Active Member

Jul 21, 2003

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ATL, Shawty

Dec 5, 2007

#26

• Dec 5, 2007

• #26

Yeah, I don't understand the popping either. Mine don't do it even with the off-road pipe.

 

M.P. Cobra Fan

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Atlanta GA

Dec 5, 2007

#27

• Dec 5, 2007

• #27

OK. I heard one today that had an actual popping. It sounded much different then mine. If that was the popping y'all are talking about, no mine does not pop.

 

the_tool_man

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May 30, 2002

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Spartanburg, SC

Dec 5, 2007

#28

• Dec 5, 2007

• #28

My car has made a popping noise off-throttle since new. When I put Flowmasters on, it just got louder. I like it. I have no leaks, and an otherwise stock exhaust system.

Regards,
John.

 

Mossberg

Active Member

Jul 21, 2003

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ATL, Shawty

Dec 6, 2007

#29

• Dec 6, 2007

• #29

It must matter if you have original 40s, deltas, or super 40s. The type of midpipe may have something to do with it also. Maybe even the exhaust diameter (2.25" vs. 2.5")

 

hotdog71

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Dec 8, 2004

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Seattle, Eastside

Dec 6, 2007

#30

• Dec 6, 2007

• #30

Hi,

Popping is normally caused by un-burnt fuel being thrown into the exhaust system causing the fuel to explode. I think you'll find it's very common in racing cars, rally cars where full throttle is followed promply by closed throttle and thus the result is popping.

Sounds quite cool really you should try it

 

1Phat5Liter

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Jul 22, 2007

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Los Angeles, CA

Dec 7, 2007

#31

• Dec 7, 2007

• #31

I ran Flows in all my 5.0s, and i used to get popping usually after letting off the gas after hard acceleration. Also used to get popping after high rpm revs at idle. I liked it

 

tank_567

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Mar 19, 2007

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Raleigh, Nc

Dec 7, 2007

#32

• Dec 7, 2007

• #32

DropTopPony said:

I don't know if Flows rob power but they aren't the best flowing muffler. I have seen several cars pick up 5-15 rwhp just by switching out the Flows for a set of Borlas or Spintechs etc...but these were all 400+ rwhp cars.

Click to expand...

I lost 8rwhp after installing flows with dumps on my car. I dyno'd at 187 stock and after I had the flowmaster 40s with dumps I had the car re-dyno'd the same day and made 179rwhp and I gained 5rwtq.

 

d98gt

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Mar 14, 2002

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Dec 7, 2007

#33

• Dec 7, 2007

• #33

That is compared with stock mufflers?

 

tank_567

Active Member

Mar 19, 2007

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Raleigh, Nc

Dec 9, 2007

#34

• Dec 9, 2007

• #34

yeap, I just had some flows welded in and lost power

 

99MustangGTVert

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Oct 17, 2007

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Dec 9, 2007

#35

• Dec 9, 2007

• #35

No popping here. Oh wait popping's cool, race cars do it, oh yeah mine pop, mine pop. LOL.

Oh wait, Ive got Violators.

HAHAHAHAHHAHAHAHA