Auto celicas... GT or GTS... aren't ever going to be "fast" off the line (0-60). Even most of the mods you'll hear about are only going to help further up the powerband. You could get a TRD
exhaust, AEM Intake
, DC headers... they all help some for overall speed, but you'd still feel sluggish off the line. Our cars just don't make that much torque anyway, and the gearing in the auto only hurts matters.