I have the Edit, and this is the best thing I have ever bought. 8 PSI is a huge increase in Power (I don't know about 300kW at the motor, but it would have to be close to 280? The 10 PSI would easily be 300kW). I have a boost gauge in the car, and yes stock peaks at 6 PSI, but is mainly 5 PSI (This is also backed up by a stock Dyno graph I have) Hope this helps Mal