stock motor/tranny will handle 500+ whp with proper tuning. Its not about the boost levels.....

there are many stock turbo srt4s spiking 22psi dropping to 16-18psi and the Stage 3 upgrade can be setup to spike 26-28psi dropping to 18-20psi. On a big turbo ive seen a couple of cars spike/creep to 26-28psi...stock motor, clutch, axles and tranny too

its all in the tune/fuel....