I took on a Stage 1 SRT-4. He has intake, boost actuator?, and of course the stage 1. He said top boost is 19. We went from a stop to 100. I launched at 1900 and neither of us spun tires. It was a really good race. He was at my back bumper then but if we had gone to about 110 it would have been even. Any farther than that and I think he would have pulled ahead. What do those cars run with those mods? I don't know that much about the SRT-4s.