Kooks headers
Thread Starter
Racer
Joined: Aug 2014
Posts: 483
Likes: 205
Kooks headers
Don't think I have ever seen aftermarket headers where the flanges are SMALLER than stock so.....Am I missing something? .....They sound good but why RESTRICT flow unnecessarily?
12:08 in the video
Racer
Joined: Aug 2019
Posts: 313
Likes: 156
From: Central Florida (Poincianna)
Will swapping out the headers and cats void the GM warranty?
Will the car require a retune/reflash to get the best performance with this swap?
'Jus wondering........
(My Plan B would be to drive it stock for a few years, and then go twin-turbo (as in screw the remainder of the warranty....)
I'm "built" next week, I think.......VIN 3222
Will the car require a retune/reflash to get the best performance with this swap?
'Jus wondering........
(My Plan B would be to drive it stock for a few years, and then go twin-turbo (as in screw the remainder of the warranty....)
I'm "built" next week, I think.......VIN 3222
Le Mans Master
Joined: Aug 2000
Posts: 5,531
Likes: 1,944
From: Austin Texas
In header design::
a) when pipes are too big you lose velocity (momentum) of the flowing gas this hurts the wave scavenging region (upper midrange) and helps the momentum scavenging region (high RPM).
b) when pipes are a bit too small (1-2mm) you gain in the midrange and lose a trifling in the high RPM band.
But, when the pipes have a proper shape and length with nice bends of constant cross sectional area and have a nice merge collector you can end up gaining midrange and gaining top end while having smaller diameter pipes.
It is only after the merge collector and after the expansion chamber (if any) that really big pipes are the ticket. After the expansion chamber it is all about getting the gasses to the exhaust tip.
a) when pipes are too big you lose velocity (momentum) of the flowing gas this hurts the wave scavenging region (upper midrange) and helps the momentum scavenging region (high RPM).
b) when pipes are a bit too small (1-2mm) you gain in the midrange and lose a trifling in the high RPM band.
But, when the pipes have a proper shape and length with nice bends of constant cross sectional area and have a nice merge collector you can end up gaining midrange and gaining top end while having smaller diameter pipes.
It is only after the merge collector and after the expansion chamber (if any) that really big pipes are the ticket. After the expansion chamber it is all about getting the gasses to the exhaust tip.
