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Headers, how much gain??

headers exhaust hp torque

25 replies to this topic

#1 cntry_boy_77

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Posted 18 April 2012 - 07:15 AM

Decided to make a new thread about headers. So I am looking for ways to add some umph to my truck. I have seen that long tube headers can add low end torque and HP. Anyone run with these types of headers? What kind of power gains have you seen? Hooked to stock exhaust or full custom?

Edited by rusty01, 18 April 2012 - 11:36 AM.

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#2 music

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Posted 18 April 2012 - 08:45 AM

I don't, so I can't answer directly. But... adding anything that changes the breathing pattern on a motor should be tuned afterwards. Otherwise, you're hurting more than helping... imho.

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#3 GMstrong

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Posted 18 April 2012 - 11:15 AM

a tune isnt need for longtubes,but with a tune youll see even a bigger gain.If you do this setup longtubes,ORY=offroad ypipe,highflow cat or no cat with a spintech muffler dumped,and K&n filter without a tune you should see an easy 25hp to the wheels thats about 40hp to the flywheel and with a tune depending on which company tunes it 35hp to the flywheel maybe even more.Plus a TR220 cam you got yourself a fun truck.
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2000 GMC Sierra SL C2500 5.7L/4L80E,3:73's 188,600 check out youtube.com/youngerprice for exhaust vids!
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#4 scz71864

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Posted 18 April 2012 - 11:36 AM

if i already had the tune done, then add headers, will i need a retune?
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#5 doug_scott

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Posted 18 April 2012 - 06:21 PM

if i already had the tune done, then add headers, will i need a retune?


Typically, yes. I am not one of those that thinks simply adding headers will give you noticable power gains, even with a tune afterwards. That would be sort of like "free horsepower". The difference in sound may make you feel like it is faster, but I am not a believer.

#6 11Silvy

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Posted 18 April 2012 - 08:17 PM

Headers alone should give you around 25-30 hp. I know a felt a pretty big difference once I got mine on and with a tune, it was night and day. HUGE upgrade right there.
Mods: 1-3/4" ARH headers, Magnaflow 3.5" with stock resonator, BB tune, Airaid Jr., LS7 tb, GM CK375 22" (SOLD)

#7 GMstrong

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Posted 19 April 2012 - 06:37 AM

So i wont feel a gain switching from these http://www.classicin...g/e/emsb12r.jpg to these
http://www.hawkinssp...1pdynatech3.jpg... I noticed a night and day difference on my vortec 350 ATLEAST a 25hp+ gain before the custom tune.On another forum i also go on the same setup same motor without a tune put down 260hp and 324ftlbs.No i said get a tune because the stock one leaves a lot on the table,I wouldnt retune for headers.Now with that being said the LS motors have shorty headers stock pretty much so yes switching to short tube headers will not gain anything but longtubes def will.
1995 Chevy Caprice 9C1 5.7L,4L60E,3:08's 134,000(Sold)
1990 GMC Sierra SLE C1500 5.7L/700R4,3:42's 300,000(Sold)
1999 GMC Sierra SLE K1500 5.3L/4L60E,3:73's 157,800
2000 GMC Sierra SL C2500 5.7L/4L80E,3:73's 188,600 check out youtube.com/youngerprice for exhaust vids!
1985 Chevy K5 5.7L/SM465/NP208,156,000(Sold)

#8 Silverado4x4

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Posted 20 April 2012 - 04:55 PM

Headers alone should give you around 25-30 hp. I know a felt a pretty big difference once I got mine on and with a tune, it was night and day. HUGE upgrade right there.


No way headers alone give you that much more HP, thats almost funny. On stock motors headers do nothing for HP and may hurt HP numbers. I guess because the exhaust is louder must mean instant HP increase. :lol: People need to stop reading the box the aftermarket parts come in. Hell if I went out and bought a performance air filter,headers exhaust, performance muffler, CAI I should see about another 200 HP according to the info on all the boxes I love when people put high flow cats on there exhaust, all cats are high flow from the factory where the vehicle is made..

Edited by Silverado4x4, 20 April 2012 - 05:11 PM.

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#9 GMstrong

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Posted 20 April 2012 - 05:48 PM


Headers alone should give you around 25-30 hp. I know a felt a pretty big difference once I got mine on and with a tune, it was night and day. HUGE upgrade right there.


No way headers alone give you that much more HP, thats almost funny. On stock motors headers do nothing for HP and may hurt HP numbers. I guess because the exhaust is louder must mean instant HP increase. :lol: People need to stop reading the box the aftermarket parts come in. Hell if I went out and bought a performance air filter,headers exhaust, performance muffler, CAI I should see about another 200 HP according to the info on all the boxes I love when people put high flow cats on there exhaust, all cats are high flow from the factory where the vehicle is made..

to each their own,i can back up post 100%.
1995 Chevy Caprice 9C1 5.7L,4L60E,3:08's 134,000(Sold)
1990 GMC Sierra SLE C1500 5.7L/700R4,3:42's 300,000(Sold)
1999 GMC Sierra SLE K1500 5.3L/4L60E,3:73's 157,800
2000 GMC Sierra SL C2500 5.7L/4L80E,3:73's 188,600 check out youtube.com/youngerprice for exhaust vids!
1985 Chevy K5 5.7L/SM465/NP208,156,000(Sold)

#10 Carder

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Posted 23 April 2012 - 08:38 AM


Headers alone should give you around 25-30 hp. I know a felt a pretty big difference once I got mine on and with a tune, it was night and day. HUGE upgrade right there.


No way headers alone give you that much more HP, thats almost funny. On stock motors headers do nothing for HP and may hurt HP numbers. I guess because the exhaust is louder must mean instant HP increase. :lol: People need to stop reading the box the aftermarket parts come in. Hell if I went out and bought a performance air filter,headers exhaust, performance muffler, CAI I should see about another 200 HP according to the info on all the boxes I love when people put high flow cats on there exhaust, all cats are high flow from the factory where the vehicle is made..


Yeah none of that would matter since you would then need your truck tuned for the benefits....

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#11 11Silvy

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Posted 23 April 2012 - 10:31 AM

I run a 13.55 in the qtr mile with those mods in my sig on 20's with 3:42's. Nahhhh, none of these mods help. Yall just keep saying that to yourself. :ughdance:

Edited by 11Silvy, 23 April 2012 - 10:33 AM.

Mods: 1-3/4" ARH headers, Magnaflow 3.5" with stock resonator, BB tune, Airaid Jr., LS7 tb, GM CK375 22" (SOLD)

#12 doug_scott

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Posted 23 April 2012 - 11:26 AM

I run a 13.55 in the qtr mile with those mods in my sig on 20's with 3:42's. Nahhhh, none of these mods help. Yall just keep saying that to yourself. :ughdance:


The OP was asking about long tube headers only. Are you getting that result with just long tube headers?

#13 11Silvy

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Posted 23 April 2012 - 11:37 AM


I run a 13.55 in the qtr mile with those mods in my sig on 20's with 3:42's. Nahhhh, none of these mods help. Yall just keep saying that to yourself. :ughdance:


The OP was asking about long tube headers only. Are you getting that result with just long tube headers?


And so was I, but this thread got derailed. I am getting that result from the mods in my signature.
Mods: 1-3/4" ARH headers, Magnaflow 3.5" with stock resonator, BB tune, Airaid Jr., LS7 tb, GM CK375 22" (SOLD)

#14 GMstrong

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Posted 23 April 2012 - 01:35 PM

you should be happy running a 13.5 in that tank.My obs 2500 weighs 4650lbs without me in it.And BTW my results were on my trucks which is a 2000 OBS and a 99 5.3L.Im not sure how the NNBS react to longtubes.should have posted that before.
1995 Chevy Caprice 9C1 5.7L,4L60E,3:08's 134,000(Sold)
1990 GMC Sierra SLE C1500 5.7L/700R4,3:42's 300,000(Sold)
1999 GMC Sierra SLE K1500 5.3L/4L60E,3:73's 157,800
2000 GMC Sierra SL C2500 5.7L/4L80E,3:73's 188,600 check out youtube.com/youngerprice for exhaust vids!
1985 Chevy K5 5.7L/SM465/NP208,156,000(Sold)

#15 11Silvy

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Posted 23 April 2012 - 01:43 PM

you should be happy running a 13.5 in that tank.My obs 2500 weighs 4650lbs without me in it.And BTW my results were on my trucks which is a 2000 OBS and a 99 5.3L.Im not sure how the NNBS react to longtubes.should have posted that before.


I'm pretty happy. I can beat alot of cars with that time and suprise the hell out of new 5.0 mustangs, camaros, whatever else that is around those low 13 high 12 sec speeds. If I drop a cam in it, I will be able to beat them. LS motors love to breathe and with the l92 (l9h engine) heads coupled to these headers, it really woke it up and that's pre-tune. The stock exhaust system wasn't restrictive, but three cats did slow it down some. ARH headers are piece of artwork.
Mods: 1-3/4" ARH headers, Magnaflow 3.5" with stock resonator, BB tune, Airaid Jr., LS7 tb, GM CK375 22" (SOLD)





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