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I think he means Hachi-Roku. I remember seeing turbo kits for the 4AG, but I agree with the masses when they say it's best to find a 4AGZE and change it from supercharged to turbo (some will say twin charge it, but then you gotta figure out that complicated setup for yourself. easier just to put the turbo on) because the engine is already built for boost. With your stock bigport you'll need to completely rebuild it (low compression pistons and gaskets, maybe a stronger crank, possibly new cams depending on the condition of your stock ones, etc.) and you will most likely have to rebuild then tranny so it has all new parts that won't snap under the huge torque boost (note: if you are pushing more than 250hp you might wanna invest in a Supra rear axle).
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