I would be a little careful with this one. The highest octane rating i have seen for unleaded is 104. The rating of 125 tells me this is leaded fuel. The main advantage to running higher octane fuel like this is to run more timing which means you really have to tune your car on a dyno. You may see a little advantage but without an engine tune it won't be much. Running leaded fuel will eventually take out your o2 sensors and plug your converter. I ran 104 in my stage 3 srt4 when i would switch it into high octane mode with the turbo toys kit and the difference was unreal but like i said the HOM button advanced the spark to handle the extra octane. Personally i wouldn't do it.