I just recieved my S300, and can't wait to pop it in my car. is there any tips or tricks to installing it. its already chipped and it came with the harness.

 

There should be no harness - it should just be an ecu with a slot for a usb cable.........you use the factory harness - it looks like a regular ecu..............

All you do is plug it in like a regular ecu, and plug the usb into the computer and you're on..........make sure the key is in the ignition........UPS said mine should be here today.........can't wait. Who did you get it from?