both the AEM CAI
(Cold Air Intake
) and the Injen
race have models for both the gt and gts.
people have said the 2nd generation AEM CAI
is superior to that of the Injen CAI
(although this is only a matter of a few horses).
it's said that the AEM Intake
provides more low end power (although it will still decrease initial torque--as almost all bolt-ons will) than the Injen CAI
. and so the Injen CAI
supposedly provides more top-end power than the AEM
(not sure about this--don't quote me).
in any case, you can view/buy them both here at: intensepower.com: engine performance accessories for toyota celica gt/gts
hope this helps