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Old 07-08-2011, 03:15 AM   #1
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Kooks Signature Series Stepped Headers- Gain 10 HP over Normal 1 7/8" Headers!

I have posted about these in various threads, but never really made a post like this because they have not been in stock. The first run of them actually sold 2 months ago based on the posts I made in other threads. Now that they are in stock, and ready to ship, I thought it was time for a formal introduction. If you have any questions, feel free to contact us!

Kooks Signature Series Stepped headers (PT# 6510-STEP) represent the best header Kooks can make for the Camaro. They feature 1 3/4" primaries stepped to 1 7/8". They also feature an extra O2 bung for wideband tuning, and Kooks standard merge spike, and merge collector. Basically they are a premium header with pretty much every feature for those looking for best you can buy. Being one of Kooks biggest dealers, we are their launch partner for this product and have the exclusive on it.

What is a Stepped Header?
A stepped header is when a header primary expands from one size to another bigger size over it's length. The size of the steps, and their placement along the length of the primary play a huge role in how effective the header is. With these headers, on average about the first one third of the primary is 1 3/4", the rest is 1 7/8".

Why does a Stepped Header make more power?
The advantage of stepped headers is that they allow you to have the best of both worlds. They have the low end TQ of a 1 3/4" header, and the high RPM HP ability of a 1 7/8" header. With these headers, the 1 3/4" initial primary pressurizes the exhaust gas more initially..then the rest being 1 7/8" allows the he header to flow a large amount of exhaust. Think of it like squeezing a hose to squirt someone. If you do it just right, the water is flowing at it's fastest, most efficiant rate. In every application we have sold them for, stepped headers make more power. Another advantage is that they are kind of one size fits all in that they support applications from stock to 700 rwhp.


On to the Results-

In the results below, we tested a 1 7/8" Kooks header vs the new Signature Series Stepped Header on our in house dyno. We did 3 runs 15 minutes apart with the 1 7/8" header, then we changed the headers to signature series and repeated the process. Everything was done on the same day, and the car was untuned to remove that variable. The only modifications the car had were a Rotofab Intake and Borla Catback Exhaust.

Best run of stepped Kooks vs. best run of 1 7/8" standard Kooks-


Three runs with stepped headers-


Three runs with 1 7/8" headers-



Just for the heck of it, here is the same car, with the same stepped headers, but now with an LPE GT9 cam, TVS 2300, and conservative tune. As you can see, the car is making 637 rwhp, which is like 750+ crank. The headers are obviously not a bottleneck up top as peak HP is right at the top of the RPM band.






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Old 07-08-2011, 05:21 AM   #2
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Wow I just bought 1 7/8 Kooks, I have no idea if their stepped.
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Old 07-08-2011, 06:41 AM   #3
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Pretty easy to identify just by looking at them. See how they look like multiple pipes welded together mid-way? Those are the steppings from 1 3/4 to 1 7/8. Generally you would see one long pipe all one size.
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Old 07-08-2011, 06:43 AM   #4
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Maryland, I thought you didn't have a shop? Or did you just mean you didn't have a physical sales office?

Did you happen to have a baseline for the car with stock headers? I'm trying to determine overall gain after install on both sets, versus just the difference between the two.

Please PM price of stepped. I'm local so perhaps pickup to save on shipping?

Regards.
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Old 07-08-2011, 07:32 AM   #5
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Damn I cant wait for the OBX ones to come out!!
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Old 07-08-2011, 08:24 AM   #6
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Price?
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Old 07-08-2011, 01:03 PM   #7
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I remember reading that stepped headers weren't ideal for F/I applications. Is this true?
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Old 07-08-2011, 01:29 PM   #8
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Quote:
Originally Posted by Sour DeeZ View Post
Wow I just bought 1 7/8 Kooks, I have no idea if their stepped.
If you did not specifically ask for them, they would be standard 1 7/8".

Quote:
Originally Posted by Infern0 View Post
Maryland, I thought you didn't have a shop? Or did you just mean you didn't have a physical sales office?
We have an 8.000 sq/ft facility in sourthern MD that has our offices, warehouse, and shop facility where we build our cars. Because we are in a rural out of the way location, and deal in a very small market of late model domestic cars, we have decided not to open to the public for now. Pictures of the facility are on our facebook page.


Quote:
Did you happen to have a baseline for the car with stock headers? I'm trying to determine overall gain after install on both sets, versus just the difference between the two.
This car in question already had the 1 7/8" headers from before we had the dyno, so it does not have a baseline. This dyno is fairly accurate however. Our other Camaro (L99 bone stock) did 324 rwhp for instance.

Quote:
Please PM price of stepped. I'm local so perhaps pickup to save on shipping?

Regards.
Quote:
Originally Posted by CaptianSam View Post
Price?
This board has rules against soliciting sales in the tech sections, and I don't want to break that and make the thread get moved. I will say we do not PM prices, and to call us for any more information on the product. Our number is in the signature.

Quote:
Originally Posted by Kilo-9 View Post
I remember reading that stepped headers weren't ideal for F/I applications. Is this true?
As you can see from the dyno provided, our car does very good with them given the mods.
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Old 07-08-2011, 01:48 PM   #9
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Dang it Branden ...I wish you had these when I got my headers man.....:( .....who knows I might (the key word is MIGHT) call and see what they running for headers only since I already have the cats and stuff
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Old 07-08-2011, 01:59 PM   #10
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Quote:
Originally Posted by MarylandSpeed View Post
As you can see from the dyno provided, our car does very good with them given the mods.
Very good or ideal? Not trying to be a jerk...just trying to understand and make the best choice for my goals. Until these came available, I had decided on Kooks 2" for my build.
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Old 07-08-2011, 02:47 PM   #11
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Will these be available with the HF cats to hook up to my magnaflow exhaust.
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Old 07-08-2011, 03:01 PM   #12
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Quote:
Originally Posted by Kilo-9 View Post
Very good or ideal? Not trying to be a jerk...just trying to understand and make the best choice for my goals. Until these came available, I had decided on Kooks 2" for my build.
I feel the stepped headers would produce a better power curve..where 2" would possibly show a higher HP number. At the end of the day the cars would drive very similar.
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Old 07-09-2011, 09:46 PM   #13
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Quote:
Originally Posted by MarylandSpeed View Post
I feel the stepped headers would produce a better power curve..where 2" would possibly show a higher HP number. At the end of the day the cars would drive very similar.
Ok...I guess I have some thinking to do. Thanks!
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Old 07-09-2011, 10:10 PM   #14
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Ok...I guess I have some thinking to do. Thanks!
Thanks! I personally am not a proponent of more complicated, or more expensive. However in this case, everytime we have tested a stepped header it has made more power. When you think about it, it is pretty narrow minded to think that having on primary size the entire length is best. Stepped headers really allow you to get the flow properlly tuned..despite the added production complication and cost.
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Old 07-09-2011, 10:18 PM   #15
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Do you have any signature series already coated in stock?

Would there be any advantage to a 1 7/8-2 step vs. the 1 3/4-1 7/8 in a F/I setup?
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Old 07-09-2011, 10:21 PM   #16
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Quote:
Originally Posted by Kilo-9 View Post
Do you have any signature series already coated in stock?

Would there be any advantage to a 1 7/8-2 step vs. the 1 3/4-1 7/8 in a F/I setup?
If you have any questions about these it would best to PM us direct. I have to make sure this stays an informational thread and not a sales thread.
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Old 07-09-2011, 10:34 PM   #17
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Does Kooks make a 1 7/8-2 stepped header?
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Old 07-09-2011, 10:40 PM   #18
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I think I'm just gunna save up a little bit more and get this instead of the regular 1 7/8's KOOKS.

Is it worth to pay the extra for this than the regular one's? I'm not going for the crazy HP build for my car. (hopefully after college I can afford to) my goal for my car for now is just Heads/Cam Ported TB/IM and maybe some other minor bolt ons.

My goal whp is 490-500 whp all motor without stroking.
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Old 07-09-2011, 11:16 PM   #19
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Quote:
Originally Posted by Txmxracer View Post
Does Kooks make a 1 7/8-2 stepped header?
They can...but they only need to enter in the equation at like 800 HP. If you go and search other LSX boards, you will find 2" headers are used very rarelyt on these cars.

Quote:
Originally Posted by GEEo View Post
I think I'm just gunna save up a little bit more and get this instead of the regular 1 7/8's KOOKS.

Is it worth to pay the extra for this than the regular one's? I'm not going for the crazy HP build for my car. (hopefully after college I can afford to) my goal for my car for now is just Heads/Cam Ported TB/IM and maybe some other minor bolt ons.

My goal whp is 490-500 whp all motor without stroking.
If you check the dynosheet above, these headers gained 10rwhp on a bolt on car. If 1 7/8" headers on average give you 30 more HP..the extra 10 HP is like a 3rd more power. I think it is worth it.
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Old 07-09-2011, 11:46 PM   #20
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If you doubt the benefits of stepped headers, look at racing headers.
F1 has at least 2 steps. It's more than just gradual flow increases.
There is a whole science with sound waves inside an exhaust system.
The choke points on collectors, merge angles,etc all influence overall performance. It really is a case of you get what you pay for.
Making a header better than the factory manifolds is easy. Making a great header is another story.
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Old 07-10-2011, 01:18 PM   #21
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my question.... yeah its 10 more up at the top.... but as for a primarily street car.... what difference does it make? the lines are almost identical all the way up until over 4k.

For a street only, or almost only street..... where is the real advantage?
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Old 07-10-2011, 01:27 PM   #22
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my question.... yeah its 10 more up at the top.... but as for a primarily street car.... what difference does it make? the lines are almost identical all the way up until over 4k.

For a street only, or almost only street..... where is the real advantage?
The real advantage is 10 more up at the top. The point you're trying to make could be applied to any mod. Why mod at all if the speed limit is 55 on roads here? The answer is pretty straightforward.....because!
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Old 07-10-2011, 04:02 PM   #23
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Quote:
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my question.... yeah its 10 more up at the top.... but as for a primarily street car.... what difference does it make? the lines are almost identical all the way up until over 4k.

For a street only, or almost only street..... where is the real advantage?
Could air intakes offer similar gains and similar RPMS's and cost $400 or more. The difference between theses stepped headers and the standard 1 7/8" is a bit smaller number.

Here is something else to consider. The exhaust port on the head is less than 1 3/4". So when you have a 1 7/8" or 2" header, the exhaust port is dumping into a header that is immediatly much bigger. This creates turbulance and reduces exhaust velocity. With the stepped header the 1 3/4" initial primary allows for the exhaust gas to transition out the exhaust port in a much smoother manner. And again..it is only 1 3/4" for a very small part of the actually lenth of the primary.
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Old 07-22-2011, 08:40 AM   #24
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Still in Stock?
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Old 07-22-2011, 10:29 AM   #25
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Yes in stock. i think we have some already in stock Jet Hot coated also..
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