what is the least restrictive muffler
Thread Starter
Team Owner
Joined: Apr 2002
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From: All humans are vermin in the eyes of Guru VA
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what is the least restrictive muffler
What is singlehandedly the least restrictive highest flowing muffler for a 2.5" exhaust system?
I keep hearing good things about dynomax ultra flows
I keep hearing good things about dynomax ultra flows
Race Director
Joined: Feb 2005
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That would be a muffler left in the box....
Just kidding...Dynomax gives cfm ratings to their mufflers...think there is a simple formula to determine your required cfm related to horsepower...
2.2 cfm per HP might be ok...
Just kidding...Dynomax gives cfm ratings to their mufflers...think there is a simple formula to determine your required cfm related to horsepower...
2.2 cfm per HP might be ok...
Last edited by rihwoods; Jul 4, 2006 at 09:33 PM.
Burning Brakes
Joined: Aug 2000
Posts: 852
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From: Katy TX
Here is what I have. You can see right through 'em.
MagnaFlow Wide Open
Mellow at idle and cruise but obnoxious at full throttle.
MagnaFlow Wide Open
Mellow at idle and cruise but obnoxious at full throttle.
Safety Car
Joined: Jun 2005
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im looking for something for a 69 350. any recomendations?
im loooking at the magnaflow 14226. 2.5 offset/center.
will these bolt right on, or will it take some moddifying?
also, maybe a dumb question, but how do these mount? my dad will only use mufflers that bolt up exactly like the stock ones do.
im loooking at the magnaflow 14226. 2.5 offset/center.
will these bolt right on, or will it take some moddifying?
also, maybe a dumb question, but how do these mount? my dad will only use mufflers that bolt up exactly like the stock ones do.
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Team Owner
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From: Middletown Connecticut
Cruise-In IV Veteran
Originally Posted by GaryS
Under car chambered exhaust. Most of the side exhaust sound, just only slightly muted.
Most of the vendors sell them, plus Allen's Stainless Exhaust.
Gary
Most of the vendors sell them, plus Allen's Stainless Exhaust.
Gary
horrible HORRIBLE exhaust.. if anything its more restrictive then stock
Le Mans Master
Joined: Jul 1999
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From: Sewell NJ
I've got the Ultraflows on my 74 and they have just about the right mix for sound and performance. They are straight through mufflers but, when new, are surprisingly quiet especially at idle. Once they are broken in they have a nice tone with just a little resonance around the 1200 to 1500 rpm range but not intrusive. At WOT they rap like the old glasspacks. I'm very happy with mine. Here's a pic.
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From: All humans are vermin in the eyes of Guru VA
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Safety Car
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From: San Diego CA
Originally Posted by Guru_4_hire
Safety Car
Joined: Dec 2004
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From: San Diego CA
Originally Posted by Guru_4_hire
Do you have any source of more accurate testing?
The test they showed with the mufflers and horsepower was done with a carbureted car and they didn't provide details as to whether or not they adjusted the jetting on it for each muffler.
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Team Owner
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From: All humans are vermin in the eyes of Guru VA
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OK, I was more interested in the flow comparisons.
I normally don't care about dyno comparisons, as they can wildly vary just like on my EFI trans am.
I normally don't care about dyno comparisons, as they can wildly vary just like on my EFI trans am.
Safety Car
Joined: Dec 2004
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From: San Diego CA
Well the flow comparisons on the mufflers is alright, but what I didn't like is they listed glasspacks but didn't give any details on the glasspacks. A glasspack is basically straight through with fiberglas around it. So I don't get how their glasspacks showed lower flowrates when they should flow better than most mufflers.
Melting Slicks
Joined: Dec 1999
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From: Mid West
Cruise-In III Veteran
My borla's can't have too much back pressure. You can see daylight reflecting thru them even with the 90 deg inlet bend already welded on. They seam to be kind of like 4 stainless steel packed glass packs (the mufflers have two passages each). Ran a 12.8 at 108 mph with them and car chemistry inserts up near the headers to knock a resonance near cruising speeds .
.
Melting Slicks
Joined: Jan 2003
Posts: 2,714
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From: Shreveport LA
LA Events Coordinator
I just recently installed a set of Borla SST Turbos (replaced FlowMasters that had rusted out after 3 years). I really like the sound and performance. Check out this link....
http://www.borla.com/products/produc...Turbo+Mufflers
http://www.borla.com/products/produc...Turbo+Mufflers
Last edited by vetteguy75; Jul 6, 2006 at 09:10 AM.