1-3/4" vs. 1-7/8" LT Headers
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Joined: Apr 2006
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From: Houston Texas
1-3/4" vs. 1-7/8" LT Headers
I am not planning on going radical on mods for my 6-spd manual C6. I am looking at the Kooks long tube headers with x-pipe and cats. Does anyone have dyno numbers for the 1-7/8" and 1-3/4" sizes? I have read that the smaller size will give me more low end torque.
Team Owner
Joined: Jan 2004
Posts: 38,772
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From: Boston MA
St. Jude Donor '06-'07-'08,'12-'13
Originally Posted by TXVette06
How do you like them? What other mods do you have? What kind of gains did you see from the headers?
Here are some pics
Team Owner
Joined: Jan 2004
Posts: 38,772
Likes: 621
From: Boston MA
St. Jude Donor '06-'07-'08,'12-'13
Originally Posted by italiangod79
what did u pay for that setup? Also what kinda exuast are u hooking into?
hooking up to corsa sport setup
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Team Owner
Joined: Jan 2004
Posts: 38,772
Likes: 621
From: Boston MA
St. Jude Donor '06-'07-'08,'12-'13
Originally Posted by GTB/ZR-1
1 3/4" will be fine w/ a 6.0L. and you'll lose some TQ w/ the larger headers. The 1 7/8" work better on a bigger CI engine or a more radical higher-RPM buildup. 
You may loose 3 to 5 Tq in the mid range on a stock ls2
But i see the lpe 403 package in my future !
since i do not want to get raped buying a z06
Le Mans Master
Joined: Mar 2006
Posts: 7,838
Likes: 1
From: Valencia '32 Ford 3 window with 615 HP!!!!
St. Jude Donor '06-'09
I have 1 7/8 on mine,and it really helps w/ the 'MAGGIE' I have!
But a larger size header is a good idea to get,in case you get some other mods down the line!
But a larger size header is a good idea to get,in case you get some other mods down the line!
Former Vendor
Joined: Nov 2004
Posts: 613
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I always recomend 1 7/8 because most people end up doing more to their cars in the future that will require the use of larger tube headers. The only time I ever install 1 3/4 is if the customer absolutely insists that he "needs" them 
But I personally have never seen a 1 3/4 header out perform a 1 7/8.
One thing you need to be careful on is coatings... Ceramic coatings will hold heat into the exhaust and cause detonation problems. Therefore cars with ceramic coated headers usually require more fueling and less timing to fix this problem... 2 things that obviously restrict hp... A set of nice uncoated stainless steel headers will do the trick, both in making horsepower, and lasting a very long time.
I would recomend a set of 1 7/8 American Racing stainless headers. The American Racing headers have a merge collector that will help torque by increasing velocity at the collector.
You can call me if you have more specific questions. I'd be happy to help you out...
Chuck @ HPE
281-448-1300
But I personally have never seen a 1 3/4 header out perform a 1 7/8. One thing you need to be careful on is coatings... Ceramic coatings will hold heat into the exhaust and cause detonation problems. Therefore cars with ceramic coated headers usually require more fueling and less timing to fix this problem... 2 things that obviously restrict hp... A set of nice uncoated stainless steel headers will do the trick, both in making horsepower, and lasting a very long time.
I would recomend a set of 1 7/8 American Racing stainless headers. The American Racing headers have a merge collector that will help torque by increasing velocity at the collector.
You can call me if you have more specific questions. I'd be happy to help you out...
Chuck @ HPE
281-448-1300
Race Director
Joined: Oct 2004
Posts: 10,516
Likes: 2
From: Virginia Bch VA
Cruise-In VI Veteran
Cruise-In VII Veteran
St. Jude Donor '06
Originally Posted by burtonbl103
I was told by many people on the ls2 to go with the 1 7/8
You may loose 3 to 5 Tq in the mid range on a stock ls2
But i see the lpe 403 package in my future !
since i do not want to get raped buying a z06
You may loose 3 to 5 Tq in the mid range on a stock ls2
But i see the lpe 403 package in my future !
since i do not want to get raped buying a z06
Hope the install goes well 4 U
Drifting
Joined: Sep 2004
Posts: 1,912
Likes: 33
From: S.D. CA
Originally Posted by Sales@HPE
I always recomend 1 7/8 because most people end up doing more to their cars in the future that will require the use of larger tube headers. The only time I ever install 1 3/4 is if the customer absolutely insists that he "needs" them But I personally have never seen a 1 3/4 header out perform a 1 7/8.
One thing you need to be careful on is coatings... Ceramic coatings will hold heat into the exhaust and cause detonation problems. Therefore cars with ceramic coated headers usually require more fueling and less timing to fix this problem... 2 things that obviously restrict hp... A set of nice uncoated stainless steel headers will do the trick, both in making horsepower, and lasting a very long time.
I would recomend a set of 1 7/8 American Racing stainless headers. The American Racing headers have a merge collector that will help torque by increasing velocity at the collector.
You can call me if you have more specific questions. I'd be happy to help you out...
Chuck @ HPE
281-448-1300
But I personally have never seen a 1 3/4 header out perform a 1 7/8. One thing you need to be careful on is coatings... Ceramic coatings will hold heat into the exhaust and cause detonation problems. Therefore cars with ceramic coated headers usually require more fueling and less timing to fix this problem... 2 things that obviously restrict hp... A set of nice uncoated stainless steel headers will do the trick, both in making horsepower, and lasting a very long time.
I would recomend a set of 1 7/8 American Racing stainless headers. The American Racing headers have a merge collector that will help torque by increasing velocity at the collector.
You can call me if you have more specific questions. I'd be happy to help you out...
Chuck @ HPE
281-448-1300
Former Vendor
Joined: Nov 2004
Posts: 613
Likes: 0
Yeah, website is old, never have time to mess with it. I'm having a new one built though right now that will have lots of new features. Call or email if you need information on anything!
Thanks,
Chuck @ HPE
281-448-1300
Mon-Fri: 9-7
Closed weekends
Thanks,
Chuck @ HPE
281-448-1300
Mon-Fri: 9-7
Closed weekends
Burning Brakes
Joined: Jun 2004
Posts: 994
Likes: 0
From: SCOTTSDALE AZ
St. Jude Donor '05
one thing you need to be careful on is coatings... Ceramic coatings will hold heat into the exhaust and cause detonation problems. Therefore cars with ceramic coated headers usually require more fueling and less timing to fix this problem... 2 things that obviously restrict hp... A set of nice uncoated stainless steel headers will do the trick, both in making horsepower, and lasting a very long time.
what about jet-hot's STERLING coating? just the outside of the header or both inside and out.
what about jet-hot's STERLING coating? just the outside of the header or both inside and out.
Team Owner
Joined: Jan 2004
Posts: 38,772
Likes: 621
From: Boston MA
St. Jude Donor '06-'07-'08,'12-'13
Originally Posted by Nukecop
one thing you need to be careful on is coatings... Ceramic coatings will hold heat into the exhaust and cause detonation problems. Therefore cars with ceramic coated headers usually require more fueling and less timing to fix this problem... 2 things that obviously restrict hp... A set of nice uncoated stainless steel headers will do the trick, both in making horsepower, and lasting a very long time.
what about jet-hot's STERLING coating? just the outside of the header or both inside and out.
what about jet-hot's STERLING coating? just the outside of the header or both inside and out.
Melting Slicks
Joined: Nov 2002
Posts: 3,398
Likes: 2
From: Allentown PA
Originally Posted by Sales@HPE
I always recomend 1 7/8 because most people end up doing more to their cars in the future that will require the use of larger tube headers. The only time I ever install 1 3/4 is if the customer absolutely insists that he "needs" them But I personally have never seen a 1 3/4 header out perform a 1 7/8.
But I personally have never seen a 1 3/4 header out perform a 1 7/8. I lost 4 HP with the 1 7/8 primaries, but then again I gained .4 in the quarter mile. Dyno sheets lie, they are for tuning, not testing parts.
If you want a dyno queen go with the smaller ones, if you want your car to perform go larger.
Team Owner
Joined: Jan 2004
Posts: 38,772
Likes: 621
From: Boston MA
St. Jude Donor '06-'07-'08,'12-'13
Originally Posted by CYA-Vett
Isn't this the truth. How many of us have said "this is my last mod"
I lost 4 HP with the 1 7/8 primaries, but then again I gained .4 in the quarter mile. Dyno sheets lie, they are for tuning, not testing parts.
If you want a dyno queen go with the smaller ones, if you want your car to perform go larger.
I lost 4 HP with the 1 7/8 primaries, but then again I gained .4 in the quarter mile. Dyno sheets lie, they are for tuning, not testing parts.
If you want a dyno queen go with the smaller ones, if you want your car to perform go larger.
This is why i went with this 1 7/8
This is my last mod
