K&N makes good products, such as the cold air intake you were speaking of, and I believe that you can get a MAF sensor adapter/filter from them as well. However, the downside to K&N filter's is that when you clean it, you'll have to re-oil it, possibly causing damage to intake sensors. I believe it's AEM that has dry filters (don't need to oil them), which might be a little more, but better for your car in the long run.
If you're looking to keep your 7MGE Supra (7MGE being your N/A's engine code) as a reliable commuter, you'll do your car could use a good tune up. Get the timing checked (or do it yourself), check/replace the belts and hoses (don't forget the systems of vacuum hoses), replace spark plugs, distributor cap, spark plug wires, etc...
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1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
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