1992 LX needs some power mods
 

Hey guys
Brand new to this board.
My '92 has 110,000 km on it and has been pampered,and is a tight solid ride.I bought it near new.
The factory exhaust has just expired,and it is geting a cat back Magnaflow system.
The car is completely stock,but I am wishing to upgrade a few things.Of course I am on a budget so it will get parts as time goes along.

Should I change the throttle body and upgrade airfilter?
My diff has never been serviced,whats a recomended performance procedure?
Also I find my tranny is a bit sticky during fast shifting,change oil/upgrade?
Are computer chips worth it?

I intend the car to be a daily driver type.I like acceleration.I dont use it for track or high speed.
Thanks in advance.