Muffler Advice

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I'm not sure about flow numbers but I got a great deal through advance online last week. I bought 2 magnaflow mufflers for $82.82 shipped to the door. I bought center in offset out 2.5" mufflers. 13216 is one of the part numbers. Just figure out what you need inlet and outlet. They have all configuration. $57.99 per muffler. Enter code a124 and you'll get $40 off and still be over $75 for free shipping. Mufflers are great quality and there are other hi performance mufflers online with advance. They have flow master too. Order them 1 at a time if they are hi enough in price just with final totals for best deal.
 
Send a PM to member VOETOM....He's extremely knowledgeable on mufflers :thumbup:
 
Thanks russhal that's a pretty good deal!
And thanks 6pk2goDemon, I was kind of
hoping VOETOM might see this and chime in.

If my math is right a 2 1/2" pipe flows about 500 cfm, no
matter the length and the muffler should be capable of
flowing in that neighborhood, it looks like the
whole system would be fairly quiet and able to keep
the exhaust pulses/waves moving along efficiently if
the muffler is not too big and turbulent or too small
and restrictive.
 
That's funny Tom, I was writing as you were answering.
I do have a question for you, What are your feeling about
the article I sited in my original post?
The author is David Vissard.
Is it correct or has new information been discovered.
I'm not totally naïve to pipe flows as I am a high pressure boiler
operator and repairman licensed for 32 yrs.

My system is Hooker Super Comps into full 2 1/2" mandrel bent pipes.
It has a 2 1/2" H pipe.
The motor is a 450 hp 360cid capable of 7000 +rpm.
I'd guess my questions are where is the most optimal
placement of the H pipe and how do I judge a muffler
that flows as well as the pipes and keep exhaust gas speeds up.
 
500 cfm per muffler..does that even relate to exhaust? Seems it would flow lots more than what it takes in...? We are not talking a pump here.
 
I checked summit racing and advance auto. They both have the flow master you mentioned for the same price. $129.99 I put the code in at advance auto and it dropped the price to $89.99. Use code trt41 or a124. Both work. Buy them 1 at a time.2 separate orders. Free shipping on all orders over $75.
 
Hooker mufflers that I have flow the best compared to others. Carcraft did the muffler flow comparison.
 
pishta said:
500 cfm per muffler..does that even relate to exhaust? Seems it would flow lots more than what it takes in...? We are not talking a pump here.
Click to expand...

We are talking about a pump of sorts only it pukes out
hot expanding gasses that need to stay moving in a smooth
orderly fashion with a minimum of restrictions so it can scavage correctly with some means of sound attenuation.

Why would I spend tons of money on an engine(like I have)to make
everything flow its level best, then not do the same for an exhaust system.

If I'm using a set of 2 1/2" pipes capable of 1000 cfm and choke them with a set of mufflers rated at 325 cfm each or a total of 650cfm it kind of defeats the purpose in my mind.

I am asking for mufflers that flow at or around 500 cfm each and
still control sound at a reasonable db level so I'm not a target for
every Barney Fife in the county, if that's possible.

I'm not sold on any muffler yet, I'm still planning the system
and looking for advice.
 
LA,
Have only a few moments but I would like to comment.

I agree with David V. and so does Walker. They both like the 2.2 cfm of airflow on a bench per HP flowed at 20 inches of mercury I think it was. Whether it is 100% correct in all cases is unknown but it has been proven time and time again that restrictive mufflers hurt power and unrestrictive ones really do not.

Regarding crossovers, we saw lots of advantages with the true X as sold by Dr. Gas. I have no test experience with any others but based on how many of them are made, I can say they will not work as well and may even hurt power in many cases. I know his work. As far as location, seems to me after our testing that anywhere in front of the mufflers worked well but experts maintain it is better up in the front.

Many mufflers work great. Chambered ones tend to be louder and unless you bump the internal diameters larger than your incoming pipes, they tend to flow less. Also, anything with lots of turn arounds hurts airflow and three pass OEM-style mufflers tends to hurt high HP engines at higher rms.

One of the best we ever found for all around goodness is the long case Dynomax SuperTurbo. They have a good mix of sound and flow for good power output and nice driveablity and the longer ones, in most cases, tend to not resonate very much, if at all. The straight-through mufflers like UltraFlos and Magnaflows and Goerlich XLERATORS and many chinese knock offs also tend to let the engine run well and longer ones help keep the tone and sound level down depending upon the perforated pattern they have and the acoustic material that was used to pack them.

I certainly agree that Aerochambers do a good job of letting a lot of air through but, they tend to be a bit louder. A photo is below of one along with a straight through muffler.

More later.
Tom
 

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Yes, years ago we worked with the SuperTrapps. Interesting muffler, used on motorcycles more often back then. Had a strange sound when you choked them down to keep them quiet. Their theory worked but they were not as "sweet" on car engine exhausts as they sound on motorcycles.
Tom
 
Thank you for your input Tom.
I've been reading about mufflers and how to build
a high flow exhaust system till my eyes bleed.
It seems very quiet and high flow are pretty hard to accomplish.

I'm hoping to build a quiet, high powered, well handling stealthmobile.
 
Couple Sites
http://www.eng-tips.com/viewthread.cfm?qid=104735
http://www.popularhotrodding.com/eng...h/viewall.html
http://victorylibrary.com/mopar/header-tech-c.htm

Old testing, but about all you can find.

Pipe Diameter (inches) Pipe Area (in2) Total CFM (est.) Max HP Per Pipe Max HP For A Dual Pipe System
1 1/2" - 1.48 - 171 - 78 - 155
1 3/4" - 2.07 - 239 - 108 - 217
2"------ 2.76 - 318 - 144 - 289
2 1/4"- 3.55 - 408 - 185 - 371
2 1/2" - 4.43 - 509 - 232 - 463
2 3/4" - 5.41 - 622 - 283 - 566
3"------ 6.49 - 747 - 339 - 679
3 1/4" - 7.67 - 882 - 401 - 802
3 1/2" - 8.95 - 1029 - 468 - 935

NOTE: These numbers are just estimates.


Muffler Flow Testing

All tests via an independent lab
All tests @ 15” wc

2 “ Straight Pipe 283 CFM
2 ¼ “ Straight Pipe 365 CFM
2 ½ “ Straight Pipe 521 CFM

2 ¼” Typical Bent tailpipe 268 CFM
2 ½” Typical Bent Tailpipe 417 CFM

2 ¼” Inlet/Outlet_ Glass Pack Tips- No Louvers- Smooth 274 CFM
2 ¼” Inlet/Outlet- Glass Pack Tips-Louvered 133 CFM
Same as above set for reverse flow 141 CFM
2 ¼” Cherry Bomb 239 CFM
2 ½” Cherry Bomb 294 CFM

2 ½” Inlet/Outlet Dynomax Super Turbo 278 CFM
2 ½” Inlet/Outlet Ultraflow Bullet 512 CFM
2 ½” Inlet/Outlet Gibson Superflow 267 CFM
2 ½” Inlet/Outlet Flowmaster ( 2 Chamber) 249 CFM
2 ½” Inlet Outlet Flowmaster ( 3 Chamber) 229 CFM
2 ¼” Inlet/Outlet Thrush CVX 260 CFM
2 ½” Inlet/Outlet Maremount Cherry Bomb 298 CFM
2 ½” Inlet/Outlet Hooker Aero Chamber 324 CFM
2 ½” Inlet/Outlet Hooker Max Flow 521 CFM
2 ½” Inlet/Outlet Borla Turbo 373 CFM
2 1/2" Inlet/Outlet Magnaflow 284 CFM

Standard OEM 2 ¼” Inlet/Outlet 138-152 CFM
Standard OEM 2 ½” Inlet/Outlet 161-197 CFM

.................................................. .........................................

This test was performed by 5.0 Mustang & Super Fords Magazine, December 2002 issue (page 55) on a '90 Mustang LX coupe with 370hp and 11 second potential. 66 pulls were made for this comparison:

The results in HP order:
1.Flowtech Warlock (open) 374.2 hp/ 333.1 tq
2.Bassani Real Street 373.7 hp/ 333.8 tq
3.Hooker Maxflow 373.5 hp/ 333 tq
4.Borla XS 373.3 hp/ 332.6 tq
5.Magnaflow 372.8 / 332.5 tq
6.MAC 372.3 hp / 331.5 tq
7.Flowtech Afterburner 372.3 hp/ 330.1 tq
8.Hooker Aerochamber 372.1 hp/ 330.4 tq
9.Bassani 372 hp/ 333.5 tq
10.Spintech 371.6 hp/ 332.2 tq
11.Edelbrock Performer RPM 370.9 hp / 331.3 tq
12.Borla XR1 370 hp/ 334 tq
13.Flowtech Terminator 369.5 hp / 331.3 tq
14.Dynomax Ultra Flo 369.4 / 333.2 tq
15.Flowmaster 369.4 hp / 331.8 tq
16.Flowtech Warlock 366.3 hp / 325.3 tq
17.No muffs 365.2 hp / 330.1 tq
.................................................. .....................................

Sound Off in Quietest to Loudest (Decibels):
1.Borla XS, 80db at idle, 90db at 2,000 rpm, 110db at WOT.
2.Hooker Maxflow, 80db at idle, 90db at 2,000 rpm, 120db at WOT.
3.Magnaflow, 82db at idle, 91 at 2,000 rpm, 114db at WOT.
4.Flowmaster, 82db at idle, 93 at 2,000 rpm, 115db at WOT.
5.Flowtech Warlock, 83db at idle, 92 at 2,000 rpm, 112db at WOT.
6.Dynomax UltraFlo, 83db at idle, 94 at 2,000 rpm, 113db at WOT.
7.Borla XR1, 83db at idle, 96db at 2,000 rpm, 118db at WOT.
8.Bassani Street, 83db at idle, 96db at 2,000 rpm, 120db at WOT.
9.Edelbrock RPM, 84db at idle, 93db at 2,000 rpm, 118db at WOT.
10.Bassani Real Street, 84db at idle, 96db at 2,000 rpm, MAX. (120+db).
11.Flowtech Afterburner, 86db at idle, 94db at 2,000 rpm, 115db at WOT.
12.Flowtech Terminator, 86db at idle, 94db at 2,000 rpm, 119db at WOT.
13.Hooker Aerochamber, 87db at idle, 94db at 2,000 rpm, 114db at WOT.
14.SpinTech, 87db at idle, 97db at 2,000 rpm, 116db at WOT.
15.MAC, 87db at idle, 98db at 2,000 rpm, 119db at WOT.
16.No Muffler, 91db at idle, 103db at 2,000 rpm, MAX. (120+db).
 

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FWIW, After years of running 1 5/8"-1 3/4" TTI step headers with open exhaust and collectors on my race car, I added their 3" exhaust with X-pipe and DynoMax Ultra Flos ending at the rear axle. I picked up between .05 & .10 in ET. This was with lots of record keeping before & after. The only down sides were the extra 60-70 lbs I had to remove from elsewhere in the car to compensate for the exhaust system weight for a fair comparison and it's a little tight when I need to pull the driveshaft or the pumpkin. I kept it on, but may switch to a DynoMax bullet type muffler for weight & clearance. Basically, I felt that the X-pipe helped and the Ultra Flos didn't hurt. I have gotten a lot of compliments on the sound. I don't know if they would be quiet enough for your tastes, at least not at full throttle. But it scared me for a while because I heard things I never heard before!

You may have to do some minor jetting changes with a more efficient exhaust. But each combo is different.
 

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Thanks Locomotion.
I'm expecting to do some rejetting.
I'm lucky in that my nephew runs a shop with a dyno and
has offered to help fine tune this thing if I ever get it together.
 
longarm said:
Thanks Locomotion.
I'm expecting to do some rejetting.
I'm lucky in that my nephew runs a shop with a dyno and
has offered to help fine tune this thing if I ever get it together.
Click to expand...

I'm jealous! lol

When you get the jetting correct, it will make accelerator pump cam and squirter tuning much easier at the track.
 
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