The Caliber SRT's were turbocharged 2.4's, but they were a completely different engine from the Neon SRT4 turbos. The Neon SRT 2.4 and the PT 2.4 turbo (which is really the same motor as the Neon SRT with a different intake and calibration) was an evolution from the earlier NA 2.4's that you could get in the cloud cars (Cirrus, Breeze, Stratus), minivans, etc.