It boggles the mind, as the supposedly "less flowy" one you can see through... What if you turn the gl***pack around backwards? I'd cobble together on of those "leafblower flowbenches" but I dont have a flowmaster muffler in my possesion. No doubt the gl***pack sounds nicer... Whats the scoop, cochese?
They have worked with exhaust pulses to make them scavenge better. they don't actually flow better they just flow different.
Even if they do, unless you're out to win the Summernationals this year, go with the one you like the sound of.
The Thrushes on my 396 sound just like the first clip, just deeper tone than their 350. They dont bark at all in normal driving but really sond off when getting into it or on backdown. LOVE IT! Scares the **** out of *****es in SUV's.
I saw a lady in a convertable BMW the other day, with the cell phone on one ear and her finger in her other ear and the most annoyed look on her face, it was so funny, and of course I left the light at full throttle, that was priceless. I have a dynomax 3 inch straight through muffler, 2 into 1 on my sbc and it sounds good.
Cherry bombs will out flow flowmasters any day of the week. Aint nuttin in there to slow anything down.
FWIW, Flowmasters don't flow all that well. If I can find it. I'll post a flow comparison chart between all the major muffler brands.
I had Flowmasters on a couple cars, 3'' pipe, 3'' muffs, very low rumble sound. I perfer the sound of Magnaflows! Put `em on the Vette with 3'' pipe, no converter, sounds badd***! They are a straight through muffler also! Check `em out!
Found it. Unfortunatly gl***packs aren't listed. They do flow less than straight pipes though because of the turbulance generated. 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
Don`t tell me, let me guess, that chart is from Dynomax! After installing couple hundred muffs, I can tell you that Dyno muffs are not of very good quality! Neck problems, and jacket problems. If you want you money`s worth get a fully welded muffler, they will last a lifetime!
Amen to Gambino there's nothing like getting up at 3:00 a.m in the morning and scareing the **** out of your neighbors to bad my neighbors are use to it
So if teh typical 2.5" exhaust with no bends flows 500cfm, then nothing attatched to it over 500 cfm wil matter. I'd also think that even with 3" pipe (which is getting large for teh average street car), nothing over 600 cfm wil matter, so anything on that list over that is simply tossing money away. And it looks like there are three Flowmaster 40 series mufflers with three different flow ratings, one of which is more than an unbent 2.5" pipe flows anyhow. I liked the sound of dual 2 chamber Flowmasters on my Ford 302, and it made plenty of power through dual 2.5 inch pipes front to back. Can't see how that makes them garbage unless I was building a top fuel car.
The Jalopy Journal
