Exhausted - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

89F150 · 10-06-2003, 22:25

Just went and visited my local exhaust guy to check out a rough price on getting an exhaust. I see you've got a dual setup 351, hows that setup and is she loud and give much performance?

351w · 10-07-2003, 20:51

yea dual exhaust rocks and you cant get anything to sound better than a good set of duals.
i run 2 1/2'' right off the headers and go to a 3'' back at the tail pipes.
i also have 3 chamber mufflers to keep the noise down but it still has a little roar to it when you jump on the throttle.
but i should tell you that with a big dual exhaust you will have little or no back pressure and might actually lose some bottom end power.
so you should do some research on what size pipes and muffller combos work.

89F150 · 10-07-2003, 22:24

So the dual system is going to get me the best sound. Does going to the three at the tail help any?

89F150 · 10-08-2003, 00:26

okay i've been doing some reading and thinking.
i'm still deciding but i think i'm not going to go with the true dual setup because of the low end power loss like you mentioned.
So i'm thinking maybe going a SI/DO muffler. Do you reckon this would be a good setup with stock pipes to the muffler and from the muffler bigger tips? Or should i go back to the drawing board? I'm mainly wanting loudness.

Also would this be louder without headers, I'm not to sure if i really need them. I know the stock manifolds are kind of small but at the moment i'm not looking for much performance.

351w · 10-08-2003, 20:51

yea a good cat back system is well worth the money and almost all are tested and proven to show gains in power.
headers will help make power and also will change the tone a bit because of the seperate pipe from each cylinder.
in a rocket scientists perspective the seperate tubes change the standing waves and also does something to the internal pressures of the other tubes.
as a rule smaller pipes will be louder and more obnoxious but a bigger pipe will give a deeper sound and if you add the larger tailpipe it acts like a megaphone and adds a little volume.

89F150 · 10-12-2003, 20:08

Just thinking about it now, the true dual exhaust wouldn't really worry the low end power that much with 4.10s and 29" tires would it?

351w · 10-12-2003, 20:18

no probably not even enough to notice unless you had access to a dyno.
is your engine all stock ?
if you tell me your specifics i can try running my dyno program and see waht happens!

89F150 · 10-12-2003, 20:22

yeah shes all stock
1899 302w EFI Stock, maybe the ford sticker adds 10hp

89F150 · 10-12-2003, 20:24

i customized the air filter baffle thing but i dont think that would do much. I like to think it does

351w · 10-12-2003, 20:36

well 89 since i dont know your cam specs or any of that i substituted some stock figures that would be close.
your actual specs may be a little higher.
but stock it came to 221 hp and 297 tq
with a dual exhaust it came to 260 hp and 330 tq.