Dude, I believe aftermarket ECU's from japan that come with ignition maps are based around using 100 octane fuel (readily available in japan)- if this is so just plugging it in and driving you'll have too much ignition advance (unless you have 100 octane fuel available?)and it's gonna ping=engine rebuild. Last time I checked a decent tune was cheaper than an engine build. If you bought the thing make use of it and get it tuned on a dyno, and do fill up with the highest octane fuel you can (readily!)......