'92 Ranger already has Cold Air intake(CAI), pretty much any fuel injected vehicle will.
Ford exhaust is "tuned" but for mid-range power in Rangers.
"Headers" can be made for low-end, mid-range or top-end power, one of those three.
Tuned exhaust creates a low pressure at the exhaust valves at a certain RPM, this helps pull out the exhaust gases so not as much crankshaft power is used to push it out, the nearer the engine is to that RPM the lower the pressure and the more power you have.
The size and length of the exhaust port pipe and the size of the "collector"(where the pipes meet) decide the RPM range where the lowest pressure will occur, the "tuned" RPM range.
It is a science and above my pay grade

, but lots of info on this on the net.
One Myth that comes from this is that "some engines need back pressure"
No 4-stroke engine runs better with back pressure, for sure, 2-stroke engine yes, but that's another story.
Where Myth comes from:
People would remove factory exhaust manifold(tuned) and slap on larger pipes, often referred to as "free flowing", so they lost the negative pressure the tuned exhaust provided, they do a test drive and discover they have LESS power........of course.
So they wrongly conclude that this engine must need back pressure, oops, lol.
Lower profile, wider tires help with handling, suspension is out of my area of suggestions.
Turbo is your best bet, electric radiator fan can free up 2-4 horse power