You pretty much named them all. A set of long tubes really wake up the 4V engines too. For CAI only go with JLT or Anderson, all the rest would flow the same as your stock box with a K&N filter in it. Dont bother with the t-body because the stock can flow more then a N/A 4.6 can. Under drives will help some too. A tune will give you the best gains though.
I would suggest upgrading your IRS bushings as well as get a diff cover brace and some full length sub frame connectors.
The bushings make a big difference on the cars bite and the FLSFCs make the car so much nicer. The diff cover brace is because when you get over 350 hp and load it hard in a corner you can crack the diff cover. And a MGW shifter would really enhance the shifting feel.
Oh, if its gonna be a DD I would suggest 3.55s or 3.73s if you are on the highway allot.
