Sidepipe Muffler Dyno Numbers
Thread Starter
Advanced
Joined: Apr 2007
Posts: 65
Likes: 0
Sidepipe Muffler Dyno Numbers
Guys,
I know this topic has been beat to death, but, I have yet to see any real comparisons between the big sidepipe muffler makers. I would like to know how the STS Spirals compare to the Hooker MaxFlows (not the regular glasspacks or reverse flows) and the Classic Chambered Exhaust Sidepipe Insert, which has one of the biggest inner diameters of the straight flow through designs at a full 3"!
So, of these three, who posts' the best dyno numbers??? I could care less about sound quality or loudness (but don't want open headers!). I want raw power figures. I'll be running a 454 fuel injected small block that dynoed at 572 hp @5,800 rpm and 585 ft./lbs. of torque @4,700 rpm.
Does anyone know of a "real" dyno comparison on these?
Thoughts, feedback?
Tony
I know this topic has been beat to death, but, I have yet to see any real comparisons between the big sidepipe muffler makers. I would like to know how the STS Spirals compare to the Hooker MaxFlows (not the regular glasspacks or reverse flows) and the Classic Chambered Exhaust Sidepipe Insert, which has one of the biggest inner diameters of the straight flow through designs at a full 3"!
So, of these three, who posts' the best dyno numbers??? I could care less about sound quality or loudness (but don't want open headers!). I want raw power figures. I'll be running a 454 fuel injected small block that dynoed at 572 hp @5,800 rpm and 585 ft./lbs. of torque @4,700 rpm.
Does anyone know of a "real" dyno comparison on these?
Thoughts, feedback?
Tony
Le Mans Master
Joined: Apr 2007
Posts: 7,353
Likes: 72
From: Graceland in a Not Correctly Restored Stingray
Nope, not me, but has anyone else yet to claim that their inserts actually outflow open headers, such as Hooker claims of the MaxFlows? Short of finding any hard dyno numbers, I'd just go with the flow...
Bump
Bump
Thread Starter
Advanced
Joined: Apr 2007
Posts: 65
Likes: 0
I spoke with Hooker...they said that their Max Flo's have an inner diameter of 2 1/4"! WTF is that? How do you call that "Max Flo"? So, needless to say, with a 570+ hp motor, I won't be going with those. It's now down to the STS Spirals or the Classic Chambered 3" inner diameters.
I wish someone had some dyno numbers on these mufflers!
I wish someone had some dyno numbers on these mufflers!
Team Owner
Joined: Nov 2004
Posts: 20,720
Likes: 25
From: Sorrento Italy
I spoke with Hooker...they said that their Max Flo's have an inner diameter of 2 1/4"! WTF is that? How do you call that "Max Flo"? So, needless to say, with a 570+ hp motor, I won't be going with those. It's now down to the STS Spirals or the Classic Chambered 3" inner diameters.
I wish someone had some dyno numbers on these mufflers!
I wish someone had some dyno numbers on these mufflers!
I can tell you my experience, which is not backed by figures but yes by my own experience with cars and engines...
I had hooker's side pipes on my SB with dinoed output at 575hp and 6.300rpms, well the only 'muffler' that wasnt restrictive over 4.000rpms was some short streight through tiny mufflers i designed and gave to build to a muffler builder...all the others kept a good flow up to 4.000/4.500 rpms but beyong that the engine revved crap.
Drifting
Joined: Jan 2008
Posts: 1,962
Likes: 5
From: Schererville IN
Go with the STS.
Nice quality and design.
Jim's customer service is #1.
The center "tube is plugged, but can be drilled out "tuned" completely for maximum flow. Lots of good feedback on here about STS.
By the way, I've got them.
Nice quality and design.
Jim's customer service is #1.
The center "tube is plugged, but can be drilled out "tuned" completely for maximum flow. Lots of good feedback on here about STS.
By the way, I've got them.
Melting Slicks
Joined: Jan 2004
Posts: 3,249
Likes: 210
From: Detroit MI
I spoke with Hooker...they said that their Max Flo's have an inner diameter of 2 1/4"! WTF is that? How do you call that "Max Flo"? So, needless to say, with a 570+ hp motor, I won't be going with those. It's now down to the STS Spirals or the Classic Chambered 3" inner diameters.
I wish someone had some dyno numbers on these mufflers!
I wish someone had some dyno numbers on these mufflers!
It sounds to me like this would be a great test for a magazine article. Seems like it would be pretty simple to do too.
Last edited by 69autoXr; Apr 21, 2008 at 04:20 PM.
Le Mans Master
Joined: Mar 2001
Posts: 6,242
Likes: 1,014
From: Watkinsville, GA and Glen Cove, NY
If you do a search, you will find loads of information including my dyno results. These results include testing of the STS baffles, Loback mufflers which are similar in design to the Max Flows, amongst others. I won't post the results again to bore everyone, and to keep it friendly since these threads don't usually end up that way. Bottom line: On MY 600+ horse 502, any muffler under 3 inches in inside diameter posed a SIGNIFICANT restriction on the engine dyno, EXCEPT, the STS baffles cut and uncapped. At that point they were only down 12 horsepower over open tubes. Quiet, no. Sound good, YES.
As to the claims of any muffler making more hp than an open tube
. Well maybe at 1500 rpms. PM me if you want more info or dyno sheets.
I was not aware that there is a 3 inch insert available. It would be an interesting test. It seems as if every engine wants something different. ZL1power on this forum, saw no restriction on his radical motor with 2.5 inch mufflers. I found differently. At some point in the past, someone calculated the open area of the baffles and it was quite large in comparison.
Bill
As to the claims of any muffler making more hp than an open tube
. Well maybe at 1500 rpms. PM me if you want more info or dyno sheets.I was not aware that there is a 3 inch insert available. It would be an interesting test. It seems as if every engine wants something different. ZL1power on this forum, saw no restriction on his radical motor with 2.5 inch mufflers. I found differently. At some point in the past, someone calculated the open area of the baffles and it was quite large in comparison.
Bill
Last edited by 69ttop502; Apr 21, 2008 at 04:48 PM.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Corvette & Porsche 911: How Two Icons Conquered the Last 25 Years
Joe Kucinski
2027 Chevrolet Silverado 1500 First Look: Everything You NEED to Know!
Michael S. Palmer
5 Best & 5 Worst Corvette Daily Drivers
Joe Kucinski
The Headlights of Every Corvette Generation Explained
Joe Kucinski
5 Best & 5 Most Overrated Corvette Track Packages of All Time!
Joe Kucinski
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
Team Owner
Joined: Nov 2004
Posts: 20,720
Likes: 25
From: Sorrento Italy
Best solution is to design and build (or give to build) a custom muffler yourself...this is what i ended up building for my 575hp engine, a short, lightweight, 3.5'' internal dia finishing in a 3'' reverse cone at the end, length if i well remember was 15''...the only muffler that could flow decently on a sidepipe over 4.000rpms without soffocating the engine...
Sometimes i miss it...
This is how it sounded at idle
This is the sound of the undercarriage exhaust 2 3/4 dia exhaust with an x pipe, at idle
This is at wot on a standing start...
...And this is the same hillclimb start with the undercarriage exhaust, same engine and set up, at wot...
Sometimes i miss it...
This is how it sounded at idle
This is the sound of the undercarriage exhaust 2 3/4 dia exhaust with an x pipe, at idle
This is at wot on a standing start...
...And this is the same hillclimb start with the undercarriage exhaust, same engine and set up, at wot...
Last edited by panic; Apr 21, 2008 at 05:23 PM.
