Headers that are not too loud

[archangl]

Just as the title states, I am looking for headers that won't make the car too loud. Currently, I have a Steeda H-Pipe, stock headers and non active axle back. I am looking for a little more power and sound. I don't want anything too loud though. I need help

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[ZXMustang]

Shame you don’t have the active. I can make my off-road headers sound stock with the exhaust in quiet mode. In normal it’s nascar loud.

 

[EFI]

Headers are headers...there's not really "quiet" or "loud" ones, they are all pretty much the same in terms of volume.

And it's going to be loud AF with long tubes and what you have now. You'd need some sort of resonator and definitely cats to keep it reasonable.

 

[Cory S]

Depends if there’s cats on the car or not. The tubes themselves don’t really add much volume if there’s cats on the car.

 

[shogun32]

Just as the title states, I am looking for headers that won't make the car too loud. Currently, I have a Steeda H-Pipe, stock headers and non active axle back. I am looking for a little more power and sound. I don't want anything too loud though. I need help

less cotton in your ears.

headers do basically nothing and you get to enjoy the joy of emissions violations or substandard cats. And another $700 for a tune. If you want more noise just change the mufflers or have a shop cut them open and remove baffling.

 

[Bill A]

less cotton in your ears.

headers do basically nothing and you get to enjoy the joy of emissions violations or substandard cats. And another $700 for a tune. If you want more noise just change the mufflers or have a shop cut them open and remove baffling.

Headers do nothing? I'm not sure where you are getting your information but headers add anywhere from 20 to 40 WHP depending on the mods you have and that's with cats. I have a 2021 GT with an A10.

 

[ZXMustang]

Headers do nothing? I'm not sure where you are getting your information but headers add anywhere from 20 to 40 WHP depending on the mods you have and that's with cats. I have a 2021 GT with an A10.

The tune makes all the power. With or without headers you aren’t going to get more. Not NA without cams and literal FBO. Or boost.

 

[Jstang23]

The stock headers on the Gen 3 Coyote are already shorty headers, and breath extremely well. Long tubes are a pain to install, but do free up some hp up top, but you loose low and middle power. The sound will change but unless you removed your cats the volume will stay pretty consistent. Unless you are pushing to get the last few hp out of the coyote, then I'd say save you money for some handling upgrades. You could get a nice suspension set up in which you'd see better performance results for your money.

 

[K4fxd]

but you loose lose low and middle power.

Got any dyno graphs that show this?

In general long tubes help low RPM power short tubes help high RPM power.

 

[Jstang23]

Got any dyno graphs that show this?

In general long tubes help low RPM power short tubes help high RPM power.

Apologize for the grammar mistake lol! That's the engineer in me

No I don't, but its pretty widely known that long tubes help higher rpm power and shorty headers help low to middle power. Obviously not every long tube application will lose power down low, but most do not make much power gains until the upper rpms.

 

[shogun32]

but headers add anywhere from 20 to 40 WHP

Yes that is a useless increase. Unless you visit the drag strip every weekend and the infinitesimal improvement in time gets you prize money, the value is zilch.

Headers stopped being useful 30 years ago.

 

[K4fxd]

No I don't, but its pretty widely known that long tubes help higher rpm power and shorty headers help low to middle power.

You have that backwards. I suggest you use some engine modeling software that uses exhaust pulse wave tuning in it's calculations, or better yet rent some dyno time and try different length headers.

I've been tuning engines since the late 1970's and the physics have not changed.

 

[Jstang23]

You have that backwards. I suggest you use some engine modeling software that uses exhaust pulse wave tuning in it's calculations, or better yet rent some dyno time and try different length headers.

I've been tuning engines since the late 1970's and the physics have not changed.

I stand by my statement. Its what I've seen in many applications, including the engines we test for manufacturers at our research facility.

https://www.motortrend.com/how-to/1...eliver better low,more horsepower at high rpm. - second paragraph

https://blog.tdotperformance.ca/gui...-tube-headers-which-is-best-for-your-exhaust/ - 6 and 7th paragraph

No offense and not trying to start something but, I think your physics are wrong

 

[K4fxd]

I think your physics are wrong

Not going to argue. Like I said rent some dyno time and test for yourself.

Exhaust tuning rule of thumb is longer tubes rock the curve below torque peak and shorter tubes rock the curve above peak torque.

 

[shogun32]

Its way more complicated than just length. Intakes the rule of thumb is short for high rpm, long for low. Exhaust it's a matter of pulse timing. I'm sure you could craft "long" to help at either end of the rpm range. Especially if you use strategic changes in diameter.

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