kooks 1 7/8 x 3" or kooks 2"x3"

[TXsilvy]

Originally Posted by jayno20

You are on the ZL1 forum, we all have blowers STOCK. No one ever said there wasn't a "need" for 2" primaries just saying it MIGHT not be worth the extra cost outweighing the benefit. 2" primaries have their place, sure, but is the cost/added weight/fitment issues worth an extra 2 or 3hp you MIGHT gain over 1 7/8 headers? Probably not.

There is more than enough data out there to prove this. I don't get why you are fighting this so hard.

Im not on a zl1 forum. I hit new posts and ended up in a zl1 section...alllll that extra weight lol.

[ABADZL1]

Allllll that performance.............

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[jayno20]

Originally Posted by TXsilvy

Im not on a zl1 forum. I hit new posts and ended up in a zl1 section...alllll that extra weight lol.

Yes you hit new posts and you are in the ZL1 "section" whatever you want to call it. Either way, we all are supercharged here. Might want to know your stuff before you make stupid posts accusing others of not knowing their stuff.

[TXsilvy]

Ok. Youre right there is never a need for 2" primary headers. Stick with 1 3/4 stepped to 1 7/8 on every build because the exhaust port on the head isnt that big. Every big name header company has a 2" option because there is never an application where one is required.

[jayno20]

Originally Posted by TXsilvy

Ok. Youre right there is never a need for 2" primary headers. Stick with 1 3/4 stepped to 1 7/8 on every build because the exhaust port on the head isnt that big. Every big name header company has a 2" option because there is never an application where one is required.

Yup that's exactly what we are saying...

[TXsilvy]

for the sake of information, I have a set of 2" primary 3.5" collector long tubes and some 1 3/4" with 3" collectors that I'm pulling off of my car. I'll get the weight of both headers to see how much heavier the bigger headers are.

also, I'm quoting this from another forum. It's my exact thoughts on supercharged exhaust, but worded better than I conveyed the message.

Originally Posted by Blown06

My .02

Header primary size/length is an important thing on an N/A combo as the scavenging effect can create some additional power.

On a blown application, scavenging is moot point. During valve overlap the boost or pressure on the intake side is just pushing additional air/fuel out the exhaust. There really is no such thing as scavenging in the exhaust system as there is never a depression in the exhaust system that is significant enough to help pull additional air/fuel into the cylinder during overlap.

In my camp, if the motor has a blower on it, use the biggest header you can fit/afford. There will not be any power loss anywhere by going bigger.

*Note: This theory of mine does not apply across the board as long as the motor is boosted. In other words.......boost from a turbo requires a whole different theory. I'm speaking only in terms of supercharged combos.