I run an AEM Water Methanol kit in my RB26 powered Z...It is a progressive kit and I use 50/50 mix myself. It is a great kit, easy to install and has made a noticeable difference in intake temps allowing for more boost/timing in my case. As far as threat to components downstream I have done quite a bit of research and the consensus appears to be that there is no threat. Take a look on Turbobuick.com. Lots of great threads about meth injection.