Topic: Muffler Performance in CFM(flow)
in Forum: C3 Fuel, Emission Control, and Exhaust Systems
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Muffler flow in CFM
OEM..................................................................... ...........225
Gibson SuperFlow 788200..............................................311
TTS Bullet Cat Converter.................................................324
Flowmaster 40 series 42540..........................................352
Flowmaster 50 Series.....................................................362
Flowmaster 40 series 43040..........................................392
Dynomax Super Turbo....................................................410
Flowmaster 62631..........................................................435
Carsound Cat Converter.................................................436
FLP Cat Converter...........................................................440
Edelbrock Victor 5535......................................................562
Flowmaster 40 series 435409..........................................576
Edelbrock RPM series 5511..............................................579
Flowmaster Delta Force Racing 54040-10........................634
Edelbrock 304 series 5560...............................................640
Edelbrock Gen App 5505..................................................708
Dynomax Race Magnum Welded 17216...........................711
Borla XR-1 40600.............................................................836
Borla XR-1 40615.............................................................854
Dynomax UltraFlow SS 17263..........................................1000
Dynomax Race Magnum Welded 17218...........................1000
Borla XR-1 40575.............................................................1100
Dynomax UltraFlow..........................................................1133
Edelbrock Victor 5537......................................................1400
Borla XR-1 40450.............................................................1400
Borla XR-1 40741.............................................................1450
Dynomax UltraFlow SS 17296, 17268..............................2200
Dynomax Race Magnum Welded 17220, 17224...............2200
Dynomax Race Magnum Welded 17225...........................2600
The formula for required exhaust flow is: horsepower times 2.2. Pretty simple eh?
So if your car makes 400 hp, you will need a total of 880 cfm muffler capacity for an unrestrictive exhaust system. So for dual exhaust, you would need mufflers that flow 440 cfm.
For reference, a 2.5 inch diameter pipe flows ~500 cfm. Adding non-mandrel bends will lessen that amount
OEM..................................................................... ...........225
Gibson SuperFlow 788200..............................................311
TTS Bullet Cat Converter.................................................324
Flowmaster 40 series 42540..........................................352
Flowmaster 50 Series.....................................................362
Flowmaster 40 series 43040..........................................392
Dynomax Super Turbo....................................................410
Flowmaster 62631..........................................................435
Carsound Cat Converter.................................................436
FLP Cat Converter...........................................................440
Edelbrock Victor 5535......................................................562
Flowmaster 40 series 435409..........................................576
Edelbrock RPM series 5511..............................................579
Flowmaster Delta Force Racing 54040-10........................634
Edelbrock 304 series 5560...............................................640
Edelbrock Gen App 5505..................................................708
Dynomax Race Magnum Welded 17216...........................711
Borla XR-1 40600.............................................................836
Borla XR-1 40615.............................................................854
Dynomax UltraFlow SS 17263..........................................1000
Dynomax Race Magnum Welded 17218...........................1000
Borla XR-1 40575.............................................................1100
Dynomax UltraFlow..........................................................1133
Edelbrock Victor 5537......................................................1400
Borla XR-1 40450.............................................................1400
Borla XR-1 40741.............................................................1450
Dynomax UltraFlow SS 17296, 17268..............................2200
Dynomax Race Magnum Welded 17220, 17224...............2200
Dynomax Race Magnum Welded 17225...........................2600
The formula for required exhaust flow is: horsepower times 2.2. Pretty simple eh?
So if your car makes 400 hp, you will need a total of 880 cfm muffler capacity for an unrestrictive exhaust system. So for dual exhaust, you would need mufflers that flow 440 cfm.
For reference, a 2.5 inch diameter pipe flows ~500 cfm. Adding non-mandrel bends will lessen that amount
Jon,-Majestic Glass Corvette Club-....Red #72,blk.interior,1979 C3 Corvette-TH350,Weiand,Holley,glass tops,Pioneer,3.55's,K&N,Dynomax,Flowmaster 40's,Energy Suspension,Spicer,VB&P(pics soon); 1978 Olds Cutlass Supreme 350/350,Dk. Blue 2-door Coupe-Hotchkis,PST,K&N,XM...'99 Mitsubishi Galant GTZ V6,black/grey leather,intake,strut bars,tint... |IMG|http://www.msnusers.com/cutlasscorvetteworkinprogress/shoebox.msnw?action=ShowPhoto&PhotoID=63|/IMG|
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