i duno bout that lol. the power delivery of each engine is different. we will find out this weekend tho! bruce (civic5lug and i are both racing at the BBQ and we both have the same bolt-ons. he is k24a2 and i am k20a2. in a straight line race, the k24 should get a slight jump but the k20 should pull top end. thats where it makes its power.