When I did mine I believe it took us close to 4-5 hours just because we werent in a hurry about it. I run H&S performances 250 tune and havent had any problems yet but then again I dont hot rod it or anything like that either. Best bet would be to figure out what the long term goal of the truck is because the waste gated kits get pretty expensive but worth it if truck is going to be raced or pulled with.