Sure the STR4 has straight line power, but what's the point if it can't turn worth jack. The Celica can easily beat the crap out of the SRT4 in a road course.
Well, that's easy to fix on an SRT4... Keep in mind, it's based off of the neon... Before the latest celicas came along, and neons were underpowered, they used to dominate the autocross course, suspension mods are plentiful for neons, and with some tewaking, they handle pretty damn good.
Before the SRT4, there was a track-package for the neon from the factory (called the neon ACR)
it was a barebones neon, no stereo, no AC, and a ton of suspension tuning and the ever-popular twincam under the bulged Hood
. they made this car for solo2 peeps, they could buy one from the dealership and go racing the same day, Mopar also offered nice contingency money for those that ran the neon, because of this, the neon became a popular auto-x car, and still is to this day.
While handling and braking are not the SRT-4's strong suit, and not even close to the celica in those terms, they are easy to find suspension bits for, and when brougt up to speed suspension and brake-wise, they are a close match for our cars...
Of course, if you mod the suspension on the celica, this is a moot point as well. sort of a polar opposite to the engine and drivetrain situation.
in the end it all depends on the drivers, and how well the cars are set up anyways.