I have a 05 silverado with a 5.3 in it now. I found a good deal on a good running ls1. I know I can bolt my intake, exhaust and oil pan on and it'll fit but I have a few questions. Should I use the truck intake? I want to use long tube headers since I've heard they free up a good bit of power. Can I just order headers for an 05 silverado with a 5.3? Do I have to get my computer reprogrammed? Someone told me I need to change the injectors. Is this true? The ls1 is stock and other than the headers I won't be doing any other work to it.