You will be able to tell the difference between 230RWHP and 250RWHP, so the jump to over 300 will knock your socks off. Lets put it this way. My 01GT I had before I sold it dynoed at 257RWHP/297RWTQ with that and gears, I was able to punch it from a roll and blow my tires off. That lowered my times from low 14's stock to 13.11. That is a HUGE difference. I think if you had over 400RWHP, it would be like driving a crotch rocket compared to a dirt bike. You would kill yourself if you tried to drive your car the same way as if you only have 230RWHP. It is something you will have to get used to. Then when 400RWHP is not enough, drop down in pulley size and bump up the boost until it knocks your socks off. Then when you get used to that, drop again till you max out your blower/turbo and have to get a bigger one.