thanks everyone i installed it tonight and went through the existing hole behind the parking brake. Test drove it tonight and i can tell you what this B%*#H is bad. Nick at Duramax Tuner has put a smile on my face. One of my tunes was an aggressive tune and i have already turned the truck sideways. The daily driver tune is pretty darn sweet compared to normal tune. I have never had any other tuner before but this tuned ECM from Duramaxtuner is awesome in my opinion and i have only had it on for an hour or so.