I'm soon to inherit a 1999 (2000?) Accord LX (on condition that I use
it): What are the commonly accepted mods to firm up it's ride and
handling?

Would an Eibach -1.5 spring kit make it ride like "a wagon"?

Are there any real power benefits to low-restriction intake and
cat-back exhaust mods, or will it just *sound* "more zoomy"?

What are allowable tire size upgrades?

Does anyone make a kit to firm up the operation of the auto trans?

And finally: Who are the established aftermarket and performance
parts houses?

TIA,
Mark