Is it a cone filter? If so, you'll need to unbolt the stock air box from the mass air flow sensor. Buy a MAF Sensor adapter (eBay, or your local auto parts store. You may need to drill new holes). Install the air flow sensor adapter on the MAF, slide a hose clamp around the base of your filter, and pop the filter on the adapter. Tighten it down, and you should be good to go.
For stability reasons, it'll be a good idea to leave the one bolt and bushing that bolts the MAF sensor to the inner fender, that way your filter won't slide into any of your belts or anything.
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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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