Hi,Here's about my car...
 

I drive a 1998 Sunfire 2.2L 5 speed base model with 257 XXX KM but still very peppy.

Full synthetic motor oil (Penzoil) and tranny fluid (Royal Purple).
K&N high flow air filter and I did the muffler intake mod.
Vibrant stainless steel high flow cat back exhaust.

I do the main maintenance myself from liquid replacement to brakes/suspension ,metal fabrication and body work.

I can do 500km (city) per tank of gas and 600km highway.

I can trust my mechanic and he don't overcharge.

1) I would do a 5th gear swap if possible.while in there put in a lighter flywheel and a ceramic clutch
2) I would like to build a ram air intake system.
3) Maybe add some curves to front fenders and relocate gas door/inlet

I saw a difference with the muffler intake gone, paired with the high flow air filter

I shaved the replacement passenger door and would do drivers side,but got to get some remote controlled actuators to open doors.

BTW: All cars should have shaved doors from the factory ,no key holes to get raped by a flat head screwdriver and a sleeker look...

nice sounds like a good car to start with but with the shaved doors its all on preference i personally like have the key holes and handles there because i tend to have bad luck with electrical devices getting destroyed due to outside forces, just an inconvenience but to each its own

Welcome! Sounds like you have got a lot of nice stuff done.

Do you have a certain brand of tire that seems to suit you the best???

Thx Larry and yes I really liked the set of Bridgestone Potenza I had for the last 4/5 years.
Need a new set for this Summer and I will have to settle for Good Year or President.

Welcome to the site Porxster. First, if your goal is MPG (which I assume it is since you are on this site), I would actually recommend against adding a RAM intake. The results here don't look very favorable for it. However, some things you can do that should be simple for you are setting the wheel alignment to zero toe and inflating the tires above stock pressure (many people here use between 40-50 PSI, just make sure you don't inflate it above max sidewall). After that, your biggest gains will probably come from aerodynamic mods. Of course, making the car lighter as well won't hurt, but it won't show as much of an improvement as improving the aerodynamic shape of the car.