Don't take the intake off. Makes it way to difficult and opens you up to more issues. Removed the alt and you will have plenty of room to work. I've done a couple this way and it really makes it easier. Like the above person said, if you have not replaced the oil filter housing gasket do it while your in there and makes life much easier. Make sure you use the winter version parts and the updated oil dipstick tube.
11 43 7 565 438 Dip Stick Guide Tube
Make sure you get an o ring for the guide tube.