I got a N/A and it sucks cause theres like nothing you can do to it to get more power out of it. You cant even find something as simple as a cold air intake, all you can get is a K&N air filter.
But my advice would be to buy a turbo motor or a supra that already had a 7MGTE in it.....thats what Im planning on doin
You have to be creative and make things for yourself, you can't expect everything to be easy and readily made for your car. I go into home depot with an idea and come out with a project. There is a LOT you can do to an NA, I might as well just start listing:
Cold air intake - Route your piping so the filter is OUT of the engine bay, mine is usually somewhere behind the foglight or turn signals
Spark plugs, wires, cap and rotor - Improve your spark for a better burn in the combustion chambers, iirc people have done an MSD ignition on the 7mge
Header - Pacesetter sells them, OBX sells them, some need to be modified slightly [the collector] but it is not a lot of work and it won't be expensive to do. Heatwrap is a MUST if you want to really utilize the power of this upgrade
Test pipe - Yes it will slightly improve power output on an NA
Catback - Recommended 2.5" for mainly stock, 3" definitely if you have lots of other supporting mods. A 3" exhaust was my biggest upgrade when I was NA
Increasing timing to 12 btdc - Made my car pull much harder and held till redline, note you should run at least 91 octane
180 degree thermostat - Make your engine run cooler for more optimal performance
Lightweight flywheel - Make your engine rev faster, less rotating mass
Lightweight driveshaft - Less rotating mass
Lightweight wheels - Less rotating mass
Electric fan - Free up a proven 2-5 hp
Electric water pump - Not a common upgrade, not sure of hp gain
High compression - A definite mod to do if you're building an na, note you'll have to tune or run higher octane gas to avoid detonation
Head work - Massive port and polishing to improve the flow will definetely increase your engines power output
Cams - Always a good power adder, although a bit pricey to have some made
Adjustable cam gears - Tune your cams and adjust your power curve for efficiency
Dyno tune - If you're hitting the dyno, you should definetely have something to tune with
And obviously you can do weight reduction and aerodynamic improvements.