Im currently trying to decide between the P1SC and the KB 2.1. I am looking for no more than 400rwhp. Goals: 1. (MOST IMPORTANT) Engine safety. I figure that no more than 400rwhp should be safe on the stock internals. I also live in TX where in the summer, high 90's are rare and 100+ is more common. I've heard that the dynamics of how a positive displacement blower works that it places more strain on the motor than a centri blower. True? 2. Fun DD street car. I never go to the track and probably wont in the future (I might go once or twice but thats it). 3. I currently have 4.10's. Are they too much for a KB? Ditching the 4.10's for some 3.73's or 3.55's is an option. I'd like to hear what you guys have to say. I'm kinda leaning towards the P1SC.