Kooks headers?
Thread Starter
Pro
Joined: Jun 2015
Posts: 639
Likes: 28
From: Wytheville Virginia
Kooks headers?
I am thinking on down the road putting kooks long tube headers, and replace the factory H pipe with the kooks X pipe, I have a Corsa Extreme 3.5" tips axle back, what size headers and kooks x pipe would be best? How loud will it be? And how much possible gains will I get in HP? Thanks
Melting Slicks
Joined: Jul 2014
Posts: 2,356
Likes: 359
From: Virginia
I run the 1 7/8" headers with 3" collector and 3" X pipe but I use the stock mufflers. It is noticeable but not terribly loud. I can't give you any HP estimates as I did a bunch of stuff at the same time but I would guess 20-30 WHP once you get tuned.
Le Mans Master
Joined: Sep 2014
Posts: 5,278
Likes: 539
From: Kelowna BC
Pretty open question. Does your car have twin turbos? Supercharged? I have a feeling it's basically stock... but it'd help to know.
If naturally aspirated, 1 3/4" headers are good.
It'll be louder, but not drastically. It'll sound much better and with a mail order tune get you 30 or so HP. Would you be keeping cats? That'll keep it tame.
Mufflers make the biggest difference in the loudness game. Adding headers will raise the volume a bit.
If naturally aspirated, 1 3/4" headers are good.
It'll be louder, but not drastically. It'll sound much better and with a mail order tune get you 30 or so HP. Would you be keeping cats? That'll keep it tame.
Mufflers make the biggest difference in the loudness game. Adding headers will raise the volume a bit.
Safety Car
Joined: Feb 2014
Posts: 3,802
Likes: 322
From: Fort Worth Texas
2017 Corvette of Year Finalist
2016 C5 of the Year
Pretty open question. Does your car have twin turbos? Supercharged? I have a feeling it's basically stock... but it'd help to know.
If naturally aspirated, 1 3/4" headers are good.
It'll be louder, but not drastically. It'll sound much better and with a mail order tune get you 30 or so HP. Would you be keeping cats? That'll keep it tame.
Mufflers make the biggest difference in the loudness game. Adding headers will raise the volume a bit.
If naturally aspirated, 1 3/4" headers are good.
It'll be louder, but not drastically. It'll sound much better and with a mail order tune get you 30 or so HP. Would you be keeping cats? That'll keep it tame.
Mufflers make the biggest difference in the loudness game. Adding headers will raise the volume a bit.
Staying N/A I would stick with 1 3/4 if you do FI I would do the 1 7/8
Thread Starter
Pro
Joined: Jun 2015
Posts: 639
Likes: 28
From: Wytheville Virginia
Pretty open question. Does your car have twin turbos? Supercharged? I have a feeling it's basically stock... but it'd help to know.
If naturally aspirated, 1 3/4" headers are good.
It'll be louder, but not drastically. It'll sound much better and with a mail order tune get you 30 or so HP. Would you be keeping cats? That'll keep it tame.
Mufflers make the biggest difference in the loudness game. Adding headers will raise the volume a bit.
If naturally aspirated, 1 3/4" headers are good.
It'll be louder, but not drastically. It'll sound much better and with a mail order tune get you 30 or so HP. Would you be keeping cats? That'll keep it tame.
Mufflers make the biggest difference in the loudness game. Adding headers will raise the volume a bit.
Le Mans Master
Joined: Sep 2014
Posts: 5,278
Likes: 539
From: Kelowna BC
I've always been happy with headers.
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Thread Starter
Pro
Joined: Jun 2015
Posts: 639
Likes: 28
From: Wytheville Virginia
Partly depending on if you do the installation. Price it out, including a mail order tune (don't forget you have to pull and mail your computer away, so you'll be without for a couple weeks), then you have to decide if 30 or so HP, better sound, etc. is worth it to you.
I've always been happy with headers.
I've always been happy with headers.
Instructor
Joined: Dec 2013
Posts: 202
Likes: 37
From: North Carolina
Agreeing with everyone else as I worked for Kook's for a short time before deciding to go back to college. If you're staying Naturally Aspirated stick with a 1 3/4" unless you have a stroked out LS3 with a huge cam making gobs of power or you're boosted, then go with 1 7/8" or 2" for huge power applications. East Coast Supercharging in NJ has a very fast turn around on the computer tuning. I've read that your car is only without the ECU for 2 days (it's a super fast turn around)
Good luck! Do a before/after dyno and let us know how it turned out!
Good luck! Do a before/after dyno and let us know how it turned out!
Acct Suspended APR 2026 by request
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2020 Corvette of the Year Finalist (performance mods)
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think about how far you want to go as far as power before you make your decision because when buying a high quality set it isn't cheap to switch to a larger size primary later on down the road... I agree with the above, if you plan to stay stock cube n/a 1 3/4's are fine and if you want to boost it or do a large cube n/a motor then do 1 7/8's or even 2" depending on how much you are after
AMP Racing
Joined: Aug 2006
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From: Washington TWP NJ
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I am thinking on down the road putting kooks long tube headers, and replace the factory H pipe with the kooks X pipe, I have a Corsa Extreme 3.5" tips axle back, what size headers and kooks x pipe would be best? How loud will it be? And how much possible gains will I get in HP? Thanks
To get the most out of the install, you should get a tune as well. For minor mods like this, a mail order tune from Doug@ECS would be a good option.
Remove the PCM, mail it to ECS, they mail it back all ready to go based on your mods.
Good luck with your project.
Melting Slicks
Joined: Feb 2014
Posts: 2,724
Likes: 149
From: chicago area IL.
i'm not a fan of mail order tuning, i'd rather spend a couple hundred more and get the car dyno tuned
yeah the mail order works but your not going to get as much HP probably as it being custom tuned and since you looking to add power with headers why leave HP out to save what $200? local shops here are $350 for a basic bolton tunes
yeah the mail order works but your not going to get as much HP probably as it being custom tuned and since you looking to add power with headers why leave HP out to save what $200? local shops here are $350 for a basic bolton tunes
Acct Suspended APR 2026 by request
Joined: Dec 2010
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Likes: 1,272
2020 Corvette of the Year Finalist (performance mods)
C5 of Year Winner (performance mods) 2019
i'm not a fan of mail order tuning, i'd rather spend a couple hundred more and get the car dyno tuned
yeah the mail order works but your not going to get as much HP probably as it being custom tuned and since you looking to add power with headers why leave HP out to save what $200? local shops here are $350 for a basic bolton tunes
yeah the mail order works but your not going to get as much HP probably as it being custom tuned and since you looking to add power with headers why leave HP out to save what $200? local shops here are $350 for a basic bolton tunes
Thread Starter
Pro
Joined: Jun 2015
Posts: 639
Likes: 28
From: Wytheville Virginia
Thanks everyone, sad to say I am broke right now and can't afford any mods, I just put a Corsa exhaust on my car and that costed some pretty pennies, hopefully when taxes swing back around then I might be able to get headers and a good tune.