Pretty good info that should be a sticky just to show results of different after marktet cat-backs.

Extremely useful. Too bad a lot of those mufflers aren't for our cars.

Consistent with my experience with Warlocks on the '57. Suckers would cost me at least a tenth when corked.

Also eye opening that the open exhaust produced the least power. Doesn't say where the exhaust was opened, though. And, I'm assuming they couldn't have produced all that data in a single day, so atmospheric conditions may have affected the results (unless they were corrected, which isn't indicated).

Too bad they couldn't have tested some "turbo" mufflers, like from Summit or Cherry Bomb. Still, that was a lot of exhaust work, and the results are very, very informative.

Pre,

your a Jays fan? wow. and from America too. very impressive. they are looking okay this year with the addition of the Henken, but does it really matter with the Bosox and yanks in the same division.

back to the topic at hand....the warlocks produce 8 hp less when corked. interesting that hooker's aero chmabers produce only ! hp andf 3 ft*lb torque less than the hooker max flows which are supposed to be wide open. that study just confirms my decision to use the aerochamber on my dual system.

Wonder what Spintech model they used.

This is exactly what was needed, an unbiased review of nearly all performance mufflers. Notice how all the mufflers are almost the same in power? This should also shut up the people who always argued that Flowmaster was so lousy and brought down power so much. IMO, buy which sounds best to you, because there's not even a 5 HP/TQ difference between nearly all of them.

Not true. Not true at all. The comparison does not apply.

Which specific mufflers did they use?
What sizes?

Those items are key. Remember - if we are talking about a very specific unbiased comparison then we need to talk specifics. They don't even mention which flowmaster muffler was used. Some FM's flow awesome. Others don't. That's just a fact. Another example is the Dynomax UltraFlo they tested. Which one? Some of the UF's flow TONS of air. Others don't. If we are talking specifics then it has to be an apples to apples comparison. It has to be apples to apples. Why? Because I could come in and say 'Flowmaster Sucks! - They were the second worse muffler in terms of max horespower. Every other muffler except for the Flowtech scored better. ' However, that just isn't true in terms of a GLOBAL statement. It is only true for the specific muffler they chose and pipe size. That is AS important as the brand of muffler.

Tim

True, they didn't specify I know, (F*rd guys did the testing ) but they were probably the Flowmaster 40's. Even if they weren't the best flowing muffler, they were still up there with the best because the differences were so minimal, not even a 4 HP/TQ difference in most cases. It's pretty funny that the claimed incredibly better flowing regular Aerochamber might have had 3 more TQ than the Flowmaster, but the Flowmaster had 1 more HP. But like you said, we really need specifics.

BTW, anyone want to e-mail that magazine and ask them what series the Flowmaster was? That'd be cool, and interesting.

one also has to realize, than any muffler or exhaust from the aftermarket, is a whole world better than any stock system.

Nice chart though, I was contimplating using one of the warlock mufflers, but i'll probably just go with another pair of bullets, I love those mufflers.

Thats exactly what I said a few days ago. Some guy was doing the old "Flowmaster sucks thing". I hope he sees this. I know they dont give enough specifics, but at least there is some proof.

https://www.thirdgen.org/techbb2/sho...hreadid=221696

Oh well.

Flowmasters 80's series muffler gives your car that muscle car sound of duals, for 80$, hard to beat, but theres so many options as far as exhaust, people will argue about until theres no more internal combustion engines.

I just wish some of these people that post and respond to these posts on these forums would learn how to type, and spell.

All good info, minus the fact they don't give part numbers, etc..

Keep in mind though.. each individual engine same or not could show different resutls. Plus.. if the engine is modified.. the only real comparison is if you install the cat back and also tune it for the new setup..

As far as the open exhaust.. any stock engine will usually lose power because it needs the back pressure of some degree.. not always true though.. some 4th gens gain with open exhaust.

But just as above.. an open exhaust is defintily going to require tunening as well.. to feed it a little more fuel if its gone to lean.. then you might gain hp, but also might lose tq.. just depends on to many factors..

What it boils down to.. get he sound you want and tune the **** of it until you get the most power with your setup.

Those results are innaccurate.

You can make absolutely no changes to a car on the dyno and see variations of 5+ horsepower and torque from run to run. On some of these, the difference is not even one or two hp, I say it does not matter.

The one thing I will agree with on this topic is that of the high performance muffler companies, thier best mufflers are all going to flow similiar and yield close hp #'s.

I think that most of the engineering for mufflers is for sound anyway.

I would like to see what kind of dyno #'s they would get out of the Mustang they used if they ran it the same way 10+ times. Had they done 5 pulls for each setup after letting the car cool, and used the average for each kind of muffler, this would have been a much more legit test.

Using an AVERAGE of multiple pulls would make this chart what you could actually consider accurate.

EDIT: Apparently they dynoed the car 66 times, so they may have averaged it or just used the best results form each setup.

ALSO: I guess although the hp and tq PEAKS can differ on the same car with no changes run to run, the curves of the hp and tq should not, and in this case they talk about how some mufflers gave better power down low and thru an average range than others.
I think that is useful and legit.