If you want to do a bunch of mods to your car, you need to be prepared to stay on the nice side of your tuner; you will be sending him money regularly, as you add pieces.
I would accumulate the pieces to do a higher performance build, and add them all at once, with a tune to go with all
Unless you want to do it yourself. You can buy tools to do this. But it is a very steep learning curve, and a mistake breaks stuff. As I well know, lol.
If I were you, I'd hold off on the piecemail mods, and pay Don for the "major upgrade" tune. He's very reasonable.
And get a wideband in the meantime; that was good advice.
a wideband to keep from killing your car, if you're going to be doing major mods.
Mods you buy aren't always perfect, and you need to know Just How Imperfect.
Datalogging is something to become familiar with; you'll want a laptop, and an xcal2 or xcal3. You may already be datalogging, excellent if you are.
Used MAFs are always suspect; It's nice to have a WB as a cross check on how things are going.
These cars are pretty quiet, stock; it's hard to hear
detonation, unless it's bad.
With a real exhaust, forget hearing anything less than a broken rod or piston, lol.
If you go lean, most likely on a nice, cool morning when it feels Really Great
™, and it will chunk pistons.
That's where all my lean spots show up, lol.