my b20 vtec is pushing 208whp and 146 wtq w/ stock sleeves. been runing it for a year. my compression is around 12.5 to 1 . b20 sleeves are not the strongest but if the car is built and tuned right it can work. another guy on this board is running a big shot of nos on a stock bottom end and he runs his car hard w/ no cracked sleeves. just letting you know sleeving is not a must.