BoostedD15B7

Just got my LM1 unit last night. Looks pretty nice. Just wondering what is the easist way to hook it up for temporary use. I was planning on putting an extra bung in at the fire wall right before the cat. i only want to use this unit to tune and then remove it. I was thinking of just running the cable out the passenger window and through the gap in hood by wipers, down the fire wall and plug it run in. I know that may sound getto, but i dont want to go running wire from the cab, though the firewall if im on gonna use for few hours at a time. Anyone else have any suggestions? I will be using it to street tune.