It will bolt in, however, you will run into problems with the onboard computer. You will have to reprogram, or maybe even change it.
4 1/4"
No
If you are talking about the dash lights , check your tail light fuse . they are on the same curcuit
This all depends on what model you have. There is no application for the V6. However if you have a TPI V8 model then, yes there are complete systems on the market for it. Here is a link to the...