I'm sure you've seen this, but just to show others:
http://www.newcelica.org/forums/showthread.php?t=204266
Quote:
Originally Posted by Boosted2.0
Flowbench Testing on GTS headers to date indicates over a 10% gain in flow from this operation. (These results will be updated if they change as test sample sizes increase). Increases may be slightly larger or smaller in some cases depending on the quality of the initial factory weld at the collector.
Total Header Increases were tested at (stock) 750 CFM average at 28" vacuum to (ported) 796 CFM average at 28" vacuum.
Individual runner flow increase is equally significant - from (stock) 205 CFM average at 28" vacuum to (ported) 236 CFM average at 28" Vacuum
GTS header porting (I don't want to give away all my secrets, but heres enough to give you the gist of what I do)
Ported Inlet
Ported Collector:
Dyno gains will vary in accordance with other mods to your vehicle. The only dyno available so far is on a 2003 GTS with stock ECU, AEM CAI, and TRD Exhaust. As you will see below there were gains of over 10 WHP and 10 WTQ at various points in the power band. It is our belief that with a more freely breathing setup significant gains would have prevailed throughout the entire RPM range.
Click Here to view Swing Fixer's comparison Dyno
Click Here to view Klutch's comparison Dyno
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Still not satisfied, even with the flowbench verification? If you end up with a aftermarket shorty header with bigger primaries for your supercharger setup, I hope you will use a programmable ECU to take advantage of them.