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i have a 92 mirage 4g15. will any 1.5 mirage intake work on it and what happens to the air flow sensor once it's installed?

and yes i've searched on here and haven't found anything useful (i'm new at this so maybe i just didn't understand...i'm an idiot i guess).

Alright, I'll give this a shot.

Any 8v intake MPI will fit any 8v MPI head from the same time frame and the same for the 12v. If you are strictly dealing with US parts I think this should be the case. I could be wrong but everything is pretty straight forward in this respect. However, if you have EGR stuff currently and need to keep it, you will need to find an intake with that provision.
Mass Air Flow sensor doesn't care about a new piece per say, as it compensates for this stuff by changing it's frequency that the computer sees, as more air comes. Thus, even with upgrades I'm about to mention shouldn't be a problem until you seriously mod the motor.

Now if you want to modify your intake, here's what I recommend (I wrote this before and then realised I hadn't answered your question properly, so bare with me ....)

Problem. You don't have any options on the intake to swap for performance, if you use either the 8 valve or 12 valve 4g15 intake, period. I know this is sounds harsh but this is the reality that CSM (Colt/Summit/Mirage) owners go through all the time.

If you have the know-how, and I mean serious smarts and mechanical fabrication ability, you could make a custom aluminum intake but you would be making it specifically for a much higher RPM range to gain any benefit. This benefits would also only come forth following a serious overhaul of the intake tract, the head, and the exhaust, so pretty much rule this option out for now.

Now for the good news. You can bolt on better parts to the original intake. For starters, you can add a 1.8L (49.5mm ~ 50mm) throttle body from the T/E/L (Talon/Eagle/Laser) cars and I believe the Hyundai Sonata. Check here http://www.4g61t.com/forum/viewtopic.ph ... highlight= for more good bolt ons, this is like Mecca to us users here. After add-ons like a K&N filter and modifying the air box you can look at more involved option like bolting on a 1.8L ECU, 1.8L injectors, and 1.8L MAF (Mass Airflow Sensor).
But, I would wait until you have proper gauges installed to keep an eye on your air/fuel ratio, just to be safe.

Hope this gets you where you want to go in the end

My Two Cents for your reading pleasure.

P.S. before I forget, the bolt-ons seriously benefit from port matching the the new parts and gaskets on the intake and the exhaust side. It is worth the time. If you are really bored and want to pay $150 or so US, you can do an Extrude Hone on the intake but you are better off doing the exhaust first.