undefeated

Is it possible to gain some power from swapping the stock mufflers with some good flowing axle back setups?

MikeVistaBlue06

Probably not. Kenne Bell says the stock exhaust on the GT can handle 600HP!

I did a search on the word exhaust and found this.

https://mustangforums.com/searchpro....mitbutton=+OK+

From what I've read it would take long tube headers, no cats, etc. to realize maybe 30hp.

Most people are replacing exhaust for the sound, not the gain in performance.

Hope this helps.

Mike

ThisBlood147

+1 You won't see any performance gains from an axleback switch alone, only a exhaust sound change. You have to start at the engine and work your way back for there to be better outflow.....not vice versa.

And realize too, that even though the flow can always be better....the stock exhaust is actually perfectly fine for most performance applications that you want to do on your car.

Newbreedgt05

You won't gain any hp, but your car will sound like it gained hp!

8URWS6

Does that mean that it really doesn't matter what axle back we put on our Mustangs being that it wont give you any noticable Hp gains, but what kind-of sound we are after?
I've heard from other people that they would only go with strait thru type mufflers because it gives them more Hp.
Personaly, if it really doesn't matter, then I would like to go with the JBA chambered mufflers cause they sound great. Has anybody delt with the JBA's here?

undefeated

I've always heard that you have to start around the cats area to notice any gains, BUT, I thought the quieter the muffler, the more restrictive.

Shard Phoenix

No, thats very untrue, you can make a 1000 hp engine as quiet as a stock honda, or of course a honda as loud as a freight train :P A lot of it has to do with set up and muffler design.

The thing is, when most people think of performance exhaust, they automatically think loud, which simply isnt true... but the muffler makers would make you think it is, because then its a battle of noise instead of gains. I have seen a lot of examples of this at the track for sportsman class etc.

undefeated

Hmmm. Well, the reason I asked this is because my friend put some SLP axle backs on his stang and it does seem to accelerate better. I'm very skeptical when it comes to mods, but I believe it accelerates a lil better. Maybe the stock ford mufflers don't flow as good as the SLP's

mikefan20

I put the SLP's Loudmouths on my GT. It seems like it accelerates better now, but i think it is only because I'm getting on the throttle more. I love the sound now!!! I turn even more heads when I drive by.

derck_mullin

MM&FF did a test a while ago and they did show some gains with the axle back systems, but it was 7hp at best if memory serves. However, many other shops have done testing and basically found no gain whatsoever.

It is all about the sound. To me the factory system is great and it DOESN'T DRONE. That is one thing I absolutely can't stand about most aftermarket exhaust. Ford actaully did this one right and gave us big tubes and free flowing mufflers. Not at all like the old 5.0 days. So, buy the exhaust for the sound or just save your $$$ for something that'll make the car run better like gears and a tune.