no he wont the rb25 and rb26 cam angle sensors are the same. ive used an rb25 CAS on my rb26 and ran just fine. but im not 100% sure if the r34 neo rb25 is different from the r33 rb25 when it came to the caseh? wrote:Buy a set of tomei poncams for R34 neo. May have issues with the CAS drive if you use an Rb26 cam.http://www.tomei-p.co.jp/_2003....html