Group Buy on K24 Stainless High Flow Headers
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Joined: Sep 2006
Posts: 1,301
From: Standing over a flat-six
Rep Power: 189
No gasket at the turbo side on the 996tt- Just the metal O-ring which can be reused. If you need the Gasket on the top end let me know.
The Turbo-side gasket for the 997tt is not included but if you can't re-use yours for any reason let me know when you submit your shipping info and I'll get them pretty cheap.
The Turbo-side gasket for the 997tt is not included but if you can't re-use yours for any reason let me know when you submit your shipping info and I'll get them pretty cheap.
Registered User
Joined: Dec 2006
Posts: 105
From: Canada
Rep Power: 24
The headers are great looking and merge Indy style collectors work. Here is an article testing typical collectors and merge with impressive results. Long story made short they picked up 11 hp and 7 lb-ft on a 500+ Hp normally aspirated engine, may be less on a Turbo.
http://www.carcraft.com/techarticles...rbs/index.html
I bought a set, will have to wait till April to try them however, the snow factor.
http://www.carcraft.com/techarticles...rbs/index.html
I bought a set, will have to wait till April to try them however, the snow factor.
Last edited by LAT; Jan 17, 2008 at 10:17 AM.
Registered User
Joined: Dec 2006
Posts: 105
From: Canada
Rep Power: 24
This information pertains to the 997TT, you may find it relevant.
In previous threads IA posted charts that when overlayed showing gains of 16 Hp and 15 lb-ft. when the headers were bolted on to an engine with a tuned ECU and stock headers.
When we overlay the posted charts the gains appear to start at 4200 rpm and carry on to red line.
From 2800 to 4200 the headers performed better than pure stock engine but not as well as tuned ECU with stock headers.
From 2000 to 2800 quite a bit less power than pure stock or tuned ECU and stock headers.
My conclusion, good gain from 2800 rpm for some loss below 2800, worth it in my estimation.
As the headers were just bolted on and run it is not obvious whether the loss bellow 2800 can be tuned in with the ECU.
I printed both graphs on the same scale and made an overlay to come to the above results, someone at IA may have more accurate information.
In previous threads IA posted charts that when overlayed showing gains of 16 Hp and 15 lb-ft. when the headers were bolted on to an engine with a tuned ECU and stock headers.
When we overlay the posted charts the gains appear to start at 4200 rpm and carry on to red line.
From 2800 to 4200 the headers performed better than pure stock engine but not as well as tuned ECU with stock headers.
From 2000 to 2800 quite a bit less power than pure stock or tuned ECU and stock headers.
My conclusion, good gain from 2800 rpm for some loss below 2800, worth it in my estimation.
As the headers were just bolted on and run it is not obvious whether the loss bellow 2800 can be tuned in with the ECU.
I printed both graphs on the same scale and made an overlay to come to the above results, someone at IA may have more accurate information.
Last edited by LAT; Jan 19, 2008 at 08:22 AM.
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