Whats going on. My name is chris, 2 year active service member of the navy new to the forum here, just bought a 2005 Chevy Duramax 2500HD LLY Automatic Trany. I bought bone stock and the only thing ive done so far is cut the muffler off and throw a 6'' tip on it ( still stock size exhaust ). Right now im looking for a plug n play or trying to find out more info on the EFI Live. This is the first diesel ive ever owned so any advice from experienced owners with performance knowledge would be great. Im also looking into putting a single stack in and not sure how big of a stack or how long i need to be just under the top of the cab, just needing ideas to make the loud whistle noise everyone turns to look for. Thanks for the help. Sincerely, MM3 (SW) Powell