i have seen gains on s2000's but i mean this excaust leak that i have i can tell the torque difference i mean puting a larger excaust could resualt in the same thing as a exchaust i am not to sure. but yea i see what your coming from but maybe the vtec 4 cylenders see the differences but mine being a ls doesnt have a good flowing head like the vtec head deos beacause of the actual vtec that i dont have.