http://www.flowmastermufflers.com/pd...ries.pdf?18,18

^Those baffels dont look like their restricting much of anything to me. Ok maybe a pony of two at WOT, but I'd like to see how people say these flow worse than stock. That is the muffler that comes in the Flowmaster American Thunder cat back with dual tips for a 93-95 LT1 Z/WS6. I think. Actually now that Im looking at it, that may be a Force two muffler since its a 3-chamber, so that makes my point even more so. If thats the VERY RESTRICTIVE flowmaster 3 chamber, how bad can the 2 chamber be lol....


Anyone have pics of "superiour" flowing crossflows cut in half so we can see/compare and end the debate of HOW bad a flowmaster really is? Id love to see a pic of Hooker's Aerochamber, cause I think they have no baffels, but im not sure.


The only way I see that muffler being of any kind of restriction is if it was on something making substantial power ( As in supercharged, TT'ed, something to that effect. That looks like it might loose 2 HP at best on a bolt on car compared to some of the best flowing designs out there.

 

Ok I checked it out. That is THE muffler they use on the:
93-95 AT Cat-Back w/dual tips.
95-97 AT Cat-Back w/daul tips.

This is the more restictive one they use in some of their other LT1 cat-backs
http://www.flowmastermufflers.com/cg...ter/53033.html

This muffler is used on:
93-95 AT Cat-Back w/single tip
95-97 AT Cat-Back w/single tip

Also is used on some of the Force II systems.

Force III have even more baffels and are even quieter

 

Just FYI, check out these #'s when considering exhuast

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).

 

Thanks Simple.

Do you know which 2 and 3 chamber mufflers they were using by chance? Seems like Flowmaster makes 3 million different mufflers

 

thats what i was wondering also, my guess is that they are 3 chambers as i dont think the 2 chambers are a very popular street muffler
but i really dont know for sure

and yeah they do make a boatload of different mufflers

 

that is a great list and what is that, the worst hp made by an open exhaust with no real improvement in tq. that means on a typical street car cutouts actually hurt you. hmmmm, very interesting, now we see dyno proof that no back pressure at all hurts a typical street car. good find simple!!!!!

 

Makes for interesting reading but doesn't apply to anything but Mustangs. A different configuration muffler from the same company will perform entirely different. For example a single inlet/ outlet muffler from XYZ company will perform differently from they're single inlet/dual outlet muffler. The test sighted above used a single inlet/single outlet.

The choice of mufflers may make a difference to someone competing at the track but for the average Joe, myself included, we won't see the difference in performance from one muffler to the other. The only thing most people seem to care about is the exhaust note. My suggestion is stop wasting time trying to determine which muffler is restrictive or not and find the one that fits your budget AND sounds the way you like it. There are much bigger problems to worry about with LT1's, and as my uncle would say, "Don't sweat the little S!@T".

Dave

 

That's the smartest thing I've read in a long time. Ahmen.

 

Interesting list. Notice that the difference between the "top performing" muffler and the bottom, excluding the open pipes is a whopping 6 hp, with almost no difference in torque. That's 1.6%. I wonder what the natural variation of the dyno is. Even after correction, you can see more variation than that on dynos from the beginning of the day to the end.

 

I have the series 80. Unless you dig the noise level INSIDE your car being somewhat high look elsewhere...otherwise I constantly get compliments with my exhaust.. However once the cat is gone...ITS LOUD!!!! We could hear my car WOT 4+ blocks away one night (not kidding). Like speedygonzales pick what you want..mufflers are cheap, replace it in a few years/months whatever if you dont like it. Have fun man.

 

i'm just the messenger
and the CFM numbers, give an example of potential of each muffler that wont matter what car its on

 

You may want to update your info - I noticed that article was dated 2002 and technology has come a long way in 2 years. You may want to check out Flowmasters new Super 40 which has twice the flow than the old 2 chamber mufflers.

Here's the description and link.

Super 40 Series Muffler, 3.00" IN (O) / OUT (O), Same Side of Case, 5" x 10" x 13" Case: each. Significantly Outflows the older 2 chamber mufflers . . . • Even More Horsepower • Less Interior sound and Deeper Exterior Sound • New Patented Design • 5 x 10 Inch Case Modeled after our Race Mufflers • Classic Black Case • Far exceeds older models on Dyno Tests The sound of our new patented Super 40 makes everybody stand up and take notice - beautiful Hot Rod sound along with increased Horsepower and Gas Mileage!

http://www.flowmastermufflers.com/cg...o79V&mv_pc=776

Just a suggestion!

kikn!

 

i know it man
it is a tad bit dated

 

Well, if thats the case I feel sorry for the poor bastards with 2 year old Flowmaster mufflers! Didn't Flowmaster say THOSE were the best mufflers 2 years ago? We all know the truth on that don't we?

 

Really makes me happy i have a magnaflow. Really cheap, sounds great, and puts out good numbers.