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Old 09-30-2012, 06:40 AM   #1
Stephen12ZL1

 
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Kooks stepped header vs 1 7/8 all the way

I see two different part #s listed for our ZL1s in the Kooks catalog. There is a signature series stepped 1 3/4" to 1 7/8" header and a 1 7/8" all the way. On their comparison the stepped header produced more hp/tq(maybe on a N/A SS). Which do you think is a better choice? I haven't called Kooks to ask but would love to hear the opinions here. Or should I ditch the Kooks idea and go with American racing 1 7/8" or another brand?
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#917 A6. 10.67@126.2 1.53 60' ATI/Lingenfelter balancer (10" ring), stock upper pulley, 90mm TB, ID850s,Rotofab/Lingenfelter intercooler reservoir, Cooler Logic HX, Lingenfelter idler relocation bracket, NGK TR7ix, 160 t-stat, Dewitts Radiator, Texas Speed 1 7/8" headers(no cats). M&H drag radials 325/45-17 & M&H 28x4.5" bias skinnies. Tuning by Frost at Performance Autosport in Richmond, VA (804) 358-2505
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Old 09-30-2012, 04:25 PM   #2
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89 views and no opinions?
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#917 A6. 10.67@126.2 1.53 60' ATI/Lingenfelter balancer (10" ring), stock upper pulley, 90mm TB, ID850s,Rotofab/Lingenfelter intercooler reservoir, Cooler Logic HX, Lingenfelter idler relocation bracket, NGK TR7ix, 160 t-stat, Dewitts Radiator, Texas Speed 1 7/8" headers(no cats). M&H drag radials 325/45-17 & M&H 28x4.5" bias skinnies. Tuning by Frost at Performance Autosport in Richmond, VA (804) 358-2505
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Old 09-30-2012, 04:33 PM   #3
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For FI, the bigger the primary the better. I don't have a ZL1, but I know the 2" is the way to go.
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Old 09-30-2012, 04:35 PM   #4
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Stepped headers would need to be specific to the ZL1 and I do not think such an animal exists. I would recommend a set of 2 inch. I am partial to ARH and Stainless Works but Kooks is good stuff too.
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