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Old Mar 10, 2024 | 04:43 PM
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Originally Posted by PMPerformance
thank you! Too much bs touted by people that think bigger is better with no data.
1.625" primaries leading to 2.5" collectors leading to 2" mid pipes is the hot ticket. Back pressure for the win!!!
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Old Mar 10, 2024 | 05:07 PM
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What kind of heat protection should I look into? I want to do everything once and not have to go back and 'fix' things.
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Old Mar 10, 2024 | 05:26 PM
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I've had the pleasure of owning three C6's. All with long tube headers. None had anything special done to any kind of heat shielding. Maybe I was just lucky. Probably over 100K miles worth of luck. Two were in the 650 rwhp range. Current one is at 500 rwhp.

Last edited by old motorhead; Mar 10, 2024 at 05:43 PM.
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Old Mar 10, 2024 | 05:52 PM
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Originally Posted by PMPerformance
humor me, is there any proof that there is any huge detriment to 1 3/4? Other than maybe a 3-5hp lower gains across the board than 1 7/8
let me humor you with this dyno sheet
stock MSD intake and ARH 1 7/8 headers vs
ported MSD intake and ARH 2” headers on a 450 cid
if I was buying headers for a Ls 3 and was looking for performance I would buy 1 7/8”
that my opinion
there plenty data out about headers on Ls 3 ,its your money I could have saved a lot of money .

if I would’ve bought right the first time
i would say the 2” headers =10hp
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Old Mar 10, 2024 | 06:18 PM
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Thanks!
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Old Mar 10, 2024 | 07:39 PM
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Originally Posted by shutout
I have a 2011 GS 6-speed . I'm going to install Kooks 1 3/4 headers and catted x pipe. Before I get it tuned, is an air intake necessary? From what I have read on this forum, the stock air filter will handle 600 hp.
if you install a front breathing air intakes like a Vararam, Id say have the tune's AFR looked at. If you install an air intake that breathes air from inside the engine bay, you should be fine.

Originally Posted by shutout
Do I need heat insulation for the torque tunnel, spark plug wires, starter?
Not that you'll "need" it, but since you have the exhaust out, Id put in the heat shield insulation. It does help reduce cabin air temperatures. Id also wrap the starter since its right there.




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Old Mar 10, 2024 | 09:43 PM
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Originally Posted by Last 1
let me humor you with this dyno sheet
stock MSD intake and ARH 1 7/8 headers vs
ported MSD intake and ARH 2” headers on a 450 cid
if I was buying headers for a Ls 3 and was looking for performance I would buy 1 7/8”
that my opinion
there plenty data out about headers on Ls 3 ,its your money I could have saved a lot of money
if I would’ve bought right the first time
i would say the 2” headers =10hp


you woulda saved me money? What would the smaller headers have done with the extra 1000rpms the bigger ones had?

You ported and Intake, upgraded headers and ran it out another 1k rpms. Of course it made more power up top

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