I did mine last night with LFR7AIX's. As for the battery in or out I left mine in. I'm stubborn and just wanted to do that way since others have and I didnt want to reflash the ECU. Man, that was tight though, i thought about pulling it several times and will next time. I was glad to see my plugs were in great shape with 54k on the car with cobb stage 2 for 15k and a TDC e-tune since for 15k! After seeing a couple posts on here i was nervous. It was a good a time , hung out with the old man and threw a few back.