.lol.have you seen them put it in a motor like yours and test it? and I say it one more time. I dont know what kind of engine were talking about here.so how can you say witch pistons to use? if its a sr20 dont waist time couse it can take that power stock if its a ka24 then yeah go for cp or whatever any fcking forged pistons will do for that mark.300hp was it?people here have research more on pistons then this companys.