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I really hate that sound.

Old 11-02-2018, 08:49 PM
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OldCarBum
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Default I really hate that sound.

I've built several cars over the years and have always had true dual exhaust and headers.
I know the new hype is adding an X pipe for performance and some people say it helps to reduce exhaust drone.
I really hate the sound from the new Mustangs, Challengers, and other cars that are louder and just slightly deeper than a Honda civic with a straight pipe.
I'm sure you all know the sound I'm speaking of.
My question is:
What effect, on the sound, will an X pipe have on my 3" true dual exhaust system with headers?
I'm talking about idle, cruising down the highway and when I decide to get into the throttle.
If you have an example, please share.


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Old 11-03-2018, 12:19 AM
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The13Bats
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Im not a fan of the pseudo muscle car siund on the new ones and i dont like cars that one has to look at the tach to know the are running.

From my experences a cross over pipe always tames the sound some cases more than others,
Im also of the mindset its one of those things needed by guys hunting that 10th of a sec in the 1320
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Old 11-03-2018, 03:20 AM
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Everything Iíve heard (with before and after results) sounds tamer/smoother with a crossover pipe. You lose the distinguished individual combustion system sounds a bit due to the blending of the chambers. Decimal of each bank is lowered because it is working through more pipe and two mufflers.

-Stroke
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Old 11-03-2018, 10:31 AM
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Combing the two pipes with an H pipe or an X pipe basically doubles the frequency and cancels out the deep base sound

also to a trained ear you can stand next to road racing track and shut your eyes and be able to pick out different engine manufacturers because of the firing order distinctive sound

so I have a 4/7 firing order swap cam in my 434 people at the track commenton how nice it sounds. That is actually making it like the same firing order as a Ford Motor. The modern vettes even have a different firing order and Mustangs have altered the degrees of the crank throws.

I have 3 inch pipes and a H pipe my present 396 sounds great
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Old 11-03-2018, 10:48 AM
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The X helps reduce high pitch frequencies, drone or volume didnt change.Agree its a trend like when the H was a big deal in the 90s.
Not a fan of how newer cars sound either, meaning they seem to mimic an AMG/Euro car. Dig duals with no crossover esp if it has a cam, to each their own.
The different firing order is supposed to be a little easier on the crank (imo doesnt matter in the grand scheme of things). Make it yours and enjoy
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Old 11-03-2018, 03:45 PM
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Originally Posted by cuisinartvette View Post
The X helps reduce high pitch frequencies, drone or volume didnt change.Agree its a trend like when the H was a big deal in the 90s.
Not a fan of how newer cars sound either, meaning they seem to mimic an AMG/Euro car. Dig duals with no crossover esp if it has a cam, to each their own.
The different firing order is supposed to be a little easier on the crank (imo doesnt matter in the grand scheme of things). Make it yours and enjoy
A trend to some, productive physics-in-action to us engineers.
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Old 11-03-2018, 03:49 PM
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Originally Posted by gkull View Post
Combing the two pipes with an H pipe or an X pipe basically doubles the frequency and cancels out the deep base sound

also to a trained ear you can stand next to road racing track and shut your eyes and be able to pick out different engine manufacturers because of the firing order distinctive sound

so I have a 4/7 firing order swap cam in my 434 people at the track commenton how nice it sounds. That is actually making it like the same firing order as a Ford Motor. The modern vettes even have a different firing order and Mustangs have altered the degrees of the crank throws.

I have 3 inch pipes and a H pipe my present 396 sounds great
I'm not following why the 4/7 swap would sound different.

I'm running a 3" system and H pipe in mine also.
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Old 11-03-2018, 06:46 PM
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Originally Posted by 69427 View Post
I'm not following why the 4/7 swap would sound different.

I'm running a 3" system and H pipe in mine also.
It sounds like the ford firing order
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Old 11-03-2018, 07:07 PM
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at cruise/wot it sounds more like an 80s 5.0 mustang note...more smooth like, same with idle you lose a little of the crackly valvey sound. The pitch changes some
No crossover has more of a gutsy hot rod tone to it
your X will still have some rasp to it on wot just not as loud thats all.

Last edited by cuisinartvette; 11-03-2018 at 07:12 PM.
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Old 11-03-2018, 07:30 PM
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Originally Posted by gkull View Post
It sounds like the ford firing order
Okay, but the mufflers don't see any difference in pulses coming out of the header collectors. The exhaust pulses are LRRLRLLR for both systems.
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Old 11-03-2018, 10:34 PM
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I don't have an X or H pipe on my 78 L-82 355, just 2.5 inch duals with 1 3/4 LTh and it has a nice sound at mid to high RPM. I do have a 94 5.0 Mustang GT that went from the ford H pipe with ford mufflers to a complete magnaflow Hi flow cats with X pipe, magnaflow straight through mufflers, and BBK shorty headers and the X pipe changed the mid to high RPM pitch of the exhaust to a smoother European sounding V8 exhaust. I have had numerous comments made to me about ":man, does that V8 sound great at high RPM". I like the X pipe improvement in sound immensely on the Ford V8.

Last edited by jb78L-82; 11-03-2018 at 10:35 PM.
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Old 11-03-2018, 10:36 PM
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Originally Posted by cuisinartvette View Post
at cruise/wot it sounds more like an 80s 5.0 mustang note...more smooth like, same with idle you lose a little of the crackly valvey sound. The pitch changes some
No crossover has more of a gutsy hot rod tone to it
your X will still have some rasp to it on wot just not as loud thats all.

Pretty accurate description of the X pipe improvement.............^^^^^^
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Old 11-03-2018, 10:44 PM
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18436572 and you change it to 18736542

LRRLRLLR LRLLRLRR

I think that it sounds smoother, but even old time racers have asked me what kind of motor do I have under the hood. When you have historical trans am cars on the track you can here the difference between chevy and ford
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Old 11-03-2018, 11:21 PM
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Originally Posted by gkull View Post
18436572 and you change it to 18736542

LRRLRLLR LRLLRLRR

I think that it sounds smoother, but even old time racers have asked me what kind of motor do I have under the hood. When you have historical trans am cars on the track you can here the difference between chevy and ford
Take what you have above, and expand the exhaust pulse sequence another firing period, and pick eight firings:

LRRLRLLRLRRLRLLR for the standard firing order.

LRLLRLRRLRLLRLRR for the 4/7 swap

They're the same LR sequence. I'm trying to understand how/why would the mufflers react/sound different?
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Old 11-04-2018, 01:42 AM
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I was mainly thinking about going with the X pipe because of the advertised performance gains.
Im not certain Inwould trade off the difference in sound for the slight performance.
Thanks
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Old 11-04-2018, 12:00 PM
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Originally Posted by OldCarBum View Post
I was mainly thinking about going with the X pipe because of the advertised performance gains.
Im not certain Inwould trade off the difference in sound for the slight performance.
Thanks
if you believe in what the car rags have to say, the X pipe is superior to an H pipe.
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Old 11-04-2018, 12:06 PM
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I just installed a Pypes "X" system exhaust on a '74 463ci Firebird. I also have an "H" system on my 465 '71 Judge. Both sound the same, and they sound really good. Here is the sound clip from Pypes with the "X" system, and I can verify that this is the way they sound:
Lars
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Old 11-04-2018, 02:57 PM
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I'm not a fan of the x pipe sound at RPM. Gets a little euro sounding.

I like the H pipe sound better. Are you going custom or using someones kit?
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Old 11-04-2018, 03:22 PM
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Originally Posted by 69427 View Post
Take what you have above, and expand the exhaust pulse sequence another firing period, and pick eight firings:

LRRLRLLRLRRLRLLR for the standard firing order.

LRLLRLRRLRLLRLRR for the 4/7 swap

They're the same LR sequence. I'm trying to understand how/why would the mufflers react/sound different?
I noticed this too and am also curious as to how/why it makes a difference.
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Old 11-04-2018, 07:33 PM
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1 7/8" Kooks headers, 3" mandrel bend SS pipe, X-pipe, Borla mufflers 3" in by duel- 2 1/4" out

525 RWHP 7,000 RPM run




Last edited by pauldana; 11-04-2018 at 07:41 PM.
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