N/A - Staying with 4.6L you're looking at ~375RWHP tops and that'll cost you. Also, I'd go 4.10s or 4.30s if you want some nice pick me up gear.
Basic bolt ons for the mean time that will work with either setup?.....
X-pipe with highflow cats, Borla or SLP LM catback (pending the sound you like), PHP or Roy intake spacer, K and N Drop in Filter, And an ALuminum DS.
Agreed.
That's why I went bigger and stayed NA.
Not cheap, but easy to work on if need be.