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CFM #'s for mufflers and dyno numbers from Car Craft

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Old 12-16-2000, 10:08 AM   #1
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CFM #'s for mufflers and dyno numbers from Car Craft

Flow #'s at 28 in. of h2o

Dynomax Race Magnum - 528 cfm
Thrush Magnum Glasspack - 507 cfm
Summit Fully Welded - 343 cfm
Flowtech Afterburner - 342 cfm
Dynomax Super Turbo - 333 cfm
Hooker Competition - 232 cfm
Summit Turbo - 309 cfm
Thrush Boss Turbo - 297 cfm

Peak #'s on a 350

Dynomax Race Magnum - 409 hp 394tq
Thrush Magnum Glasspack - 409 389
Summit Fully Welded - 415 390
Flowtech Afterburner - 409 391
Dynomax Super Turbo - 412 387
Hooker Competition - 397 381
Summit Turbo - 405 383
Thrush Boss Turbo - 407 384

Avg #'s on a 350 from 2,500 to 6,000 rpm

Dynomax Race Magnum - 298 hp 366tq
Thrush Magnum Glasspack - 297 365
Summit Fully Welded - 295 362
Flowtech Afterburner - 294 361
Dynomax Super Turbo - 292 358
Hooker Competition - 286 351
Summit Turbo - 291 357
Thrush Boss Turbo - 292 357

Well there you have it!


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Old 12-21-2000, 10:11 PM   #2
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Location: Omaha, NE
Posts: 803

What pipe diameters?

84 Camaro ZZ4 with HOT cam. 1.88 60' (12.98 @ 105MPH E.T.)
Other Mods: You name it and I have probably changed it.

91 Firebird 5.0L TBI

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Old 12-23-2000, 10:19 PM   #3
Join Date: Oct 1999
Location: mission hills ,ca
Posts: 381

Those are for mufflers under $40 ,hence no flowmaster , hooker aerochamber, borla ,[email protected] ,mufflex, ect...
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Old 01-01-2001, 03:38 PM   #4
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Join Date: Jul 2000
Location: Kempner,TX,
Posts: 1,014
Car: 1996 Vette / 1992 GSX1100F Suzuki
Engine: 1996 Corvette Coupe 388 LT1 (+.060)
Transmission: Auto
Axle/Gears: 3.07

What month was the issue that had all that good info? Did it show any sound level comparisons too.

Thanks, and Happy New Year.


1986 Corvette Coupe, 415 CID, Edelbrock 6073s, ZZ9
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Old 01-01-2001, 10:59 PM   #5
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Join Date: Jul 2000
Location: gilmer,tx
Posts: 86

I've got a "muffler shop special" 3' intermediate pipe with no cat and a 3' race magnum on my GTA. It doesn't sound the best I've ever heard but it came that way, after I got the car I cut the tailpipe off and at parking lot speed barely riding the brake it rattles tin roofs (SONIC DRIVE IN) and sets off car alarms. AWesome sound like that and very throaty when I get on it.I'd recomend it for that but it's still not exactly the sound I'm looking for.
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Old 01-01-2001, 11:08 PM   #6
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Join Date: Jul 1999
Location: 51N 114W, 3500'
Posts: 16,332
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86

Not much but good reading concerning the topic.

Stephen's racing page

87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
454 Big Block buildup now in progress for the 2001 racing season

Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Altitude corrected rear wheel HP based on power to weight ratio: 476.5
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley
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