I am selling a AEM Bypass Valve for the 2000 civic Si, it will save ur engine from hydro failure in rain or puddles, if u have a CAI u definitely need this, and dont wory about hp losses, nothing is lost, i am selling it for only 35 $ , it is still in its original packaging, never used, shipping will be 10 dollars in so cal and may vary anywhere outside of so cal. reply if you would like to buy it or email me at pikachuoo2@yahoo.com thanks again!