Interesting flow numbers on mufflers
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TECH Senior Member
Joined: Nov 2001
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Interesting flow numbers on mufflers Look how well the dynomax Ultraflo/race magnum mufflers do on this test!!!
MODEL Flow Rate Muffler Inlet Size
Flow test pressure @ 20.3" H2O
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"
MODEL Flow Rate Muffler Inlet Size
Flow test pressure @ 20.3" H2O
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"
Flow #'s I found it strange that the 3" magnum flowed the same as the 3.5" magnum. I expected the borlas to have better numbers.
If you look at the Dynomax web site it says 2200+ and thats why the seem to flow the same...Zed
If you look at the Dynomax web site it says 2200+ and thats why the seem to flow the same...Zed
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Joined: Feb 2004
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Originally Posted by wvaboy
if i'm reading that right, flowmaster really sucks?
any numbers for the corsa? borla and corsa are separate right?
i may have to dump my old azz flowmasters for something new.
any numbers for the corsa? borla and corsa are separate right?
i may have to dump my old azz flowmasters for something new.
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FYI, I got curious the other day and put a pressure guage on my exhaust. I have an SLP 2OTL on my car, which runs bottom 11s at over 120. The SLP 2OTL is supposed to be one of the quieter good flowing mufflers. It appears to be straight through, but is quiet enough for an old man like me. Anyway, I had a friend watch the guage (which was 15 PSI full scale) during a pass through the gears and he couldn't read even 1/2 PSI backpressure.
