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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 03-25-2012, 07:57 PM   #1
Gaddism1
 
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Kooks Signature Series Stepped Long Tube Headers

Kooks claims a 10HP increase with their stepped LT Headers over the regular LT's. Anyone have experience with the Kooks Signature Stepped LT's?
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Old 03-25-2012, 08:17 PM   #2
axis
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There's lots of info available.

http://www.camaro5.com/forums/showth...tepped+headers

http://www.camaro5.com/forums/showth...tepped+headers

http://www.camaro5.com/forums/showth...tepped+headers

http://www.camaro5.com/forums/showth...tepped+headers

http://www.camaro5.com/forums/showth...tepped+headers
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Old 03-25-2012, 09:13 PM   #3
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We have sold about 50 sets now, and everyone has been satisfied. Obviously not many people dyno them back to back against standard 1 7/8" headers..but every time a dyno test is posted on them, they are on the very high end of what you would expect with headers.

Here is a dyno test we did about a year ago-

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Old 03-25-2012, 10:41 PM   #4
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I have them on my car and I gained 51 rwhp with these headers and a tune..

I love them. sound great too.
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Old 03-25-2012, 11:11 PM   #5
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Quote:
Originally Posted by Soundplus View Post
I have them on my car and I gained 51 rwhp with these headers and a tune..

I love them. sound great too.

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Old 03-26-2012, 10:17 AM   #6
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I don't have a before and after, but I dynoed 373 rwhp and 368rwtq on a L99 with Kooks Stepped Headers, a Tune and a CAI with scoop.

It's a no brainer if you ask me.
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Old 03-26-2012, 10:21 AM   #7
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I got em.

And I bought them from Maryland Speed - WHICH IS AN AWESOME VENDOR. 4 THUMBS UP.


I haven't dynoed or tuned the car yet, but I am very happy with them. Adding a Vortech V3 setup right now, so I'll have results with the blower soon.
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Old 03-26-2012, 11:17 AM   #8
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I have them and put down 464 @ the wheels with a TSP 229/236 cam. It's hard to say what difference they made but most cars with same cam put down between 450-470 so I am closer to the top end of that spectrum.
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Old 03-26-2012, 08:48 PM   #9
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Wasn't someone talking about doing a stepped vs regular back to back comparsion on a dyno?
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Old 03-26-2012, 10:23 PM   #10
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From my experiences, stepped headers will give you more under the curve. You won't neccesarily see higher peak #'s. Heres a graph that we did with my GTO. First test was with 1 3/4 headers, second with stepped headers.

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