stanglx2002

Here is a few muffler companies. Everybody gets flows and when people say they arent performance mufflers they argue they are so here is a comparsion chart that proves they are the lowest on performance. I have Ultra Flows on my car and i love them. They dont have any drone at all. I had flows and then switched to Dynomax's and love them. I have seen a lot of people talking about mufflers so i thought i would post this so everybody knows the facts.

Djs94stang

I agree. Ultraflows are similar to Magnaflow's which I have. I don't think you can beat a straight through muffler. They are the best sounding mufflers I've had....no drone either.

stanglx2002

i agree i hate the drone sound and i want everybody to know the facts about what they are going to buy before they buy it

sastangman

spintech

94Cbra

I too like everyone to know their facts before they buy...

That "chart" is from Dynomax's website. Flowmaster and Borla take a lot of their sales. Of course they are going to put up somthing like that. According to the info you are about to read Dynomax Ultra Flows made 0 HP over Flowmasters (even numbers for both) and only +1.4 tq over Flowmasters. I never said Flowmasters were the best, but I did say they were up to par with everyone else. Dyno charts have proven over and over again that the HP difference between mufflers and catback kits are minimal. This is common knowledge with domestic performance. Flowmasters have been the choice mufflers in the NMRA for years and years. If they were not a performance muffler then I doubt they would continue to use them. You have to realize that with muffler technology peaking out, the performance exhaust industry is becomming a cut-throat business. With buyers more knowledgable about what they buy, the "#1 muffler" kick is running out and its becomming a matter of choice. The advertisments you see are a direct result of that.

Here is some unbiased information as well as references and page numbers.



Results based on 5.0 Mustang Magazine December 2002 issue (page 55). Test car is a ’90 Coupe with 370 HP and 11 second potential. A number of 66 pulls were made to compile this information.

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).

vfast

borla xs..would be my choice if I went by the numbers quite and powerful

89stanglx

How can the Flowtech Warlock (open) be the most powerful, yet no muffler is the least amount of power. The backpressure would be the same, and the exhaust pipe would still be the same length between the two basically dumping shortly after the midpipe. The Flowtech Warlock (open) would be straight through design as if you installed dumps after the midpipe, And what about thrush glasspacks which i never hear mentioned around here, how would they compare with sound and power.
I have flowtech terminators which are about identical to flowmasters only cheaper.

vfast

old thrush..man I used them 20 years ago...they flow awsum just got to loud after 6 months when all the f'glass burnd away

mkspeed26

im goin with summit glasspacks with the stang for now until i do my dual 3" next year. pretty good for only 20 bucks

Pure5.0

Of course there are going to be mufflers out there that out flow others...that is a given fact.

But looking at the exhaust chart of the mufflers think of this. Flows push out about 382 cfm I think. Now you have dual exahust to multiply that number by 2. You get over 700cfm which is well over any intake throttle body will allow.

Of course you are going to say that the intake air is cooler than the exhaust therefore less air. That is true. As the engine heats up the exhaust you get more volume of air but less mass per cubic foot. This means that the air is less dense coming out of the exhaust.

Think of it as viscocity of air...if the air is dense (intake air) then imagine it like syrup. The exhaust gas is less dense but more (water). It will be about the same as far as intake and outtake effort.

So even though the ultraflo ss push 1000cfm but the engine is not sucking up enough air then you will never utilize the ultraflo ss.

The big issue that we should be concerned with is SOUND.

My question on top of all this is which mufflers are bad at drone....with stock gearing and with 3.73 gears?