I have been running propane injection in my 94 es300 for about 8 months now. It has been very good saving me gas money and adding some hp and smoothing out some flat spots in the rpm band. I recently also added nitrous injection running a dry kit at a 125hp shot. I have not been disappointed with either! Both mods are quite simple and have made the car much more enjoyable to drive. I will post pics if anyone is interested in my system.