Well welcome. You'll love if you don't already
The earlies didn't have the foil.
Not sure what you mean by the MAC intake, but I did the DIY intake with a Bladwin filter and made an air box for it. Wonderful stuff.
If you're gonna run stock all the way up to say 400 horse, you're probably ok with the stock 3.5" as long as you straight pipe/straight muff it. I bought the 60 somethin dollar Walker Big Truck Muffler. Keeps it legal and it's just like it's straight pipe. Did yours come with a CAT? Mine didn't. Most people run 4" straights though.
For a tuner, DON'T get an Edge. They are fine if you never floor it, but if you do, you're trans is gonna be gone fast. Really with any generic tuner, it'll be that way. If you get a Tony Wildman tuned TS 6 position chip, or a DP tuner tuned by Bill at Power Hungry Performance, you'll be good to go for a long time on that transmission. They are amazing at what they do and have lots of experience. Can't beat custom tunes.
As for the Edge for gauges, some ppl do it and it's all preference at that point. But basically, transmission temp, EGTs, and boost are the three major gauges. ISSPRO has good gauges. Personally I'm gonna get some DiPricol gauges cause I like that factory match.