These cars came with single platinum plugs, meaning 1 of the 2 electrodes are platinum. Iridium plugs are similar, they have a platinum negative electrode and an iridium positive electrode for longer life. If you want something that is more likely to give you a better spark over OE, then run a double platinum (both electrodes are platinum). They are cheaper than iridium plugs, too.
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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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