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The 4A-GZE block will handle more boost than the internals will. I belive that the stock 4A-GZE internals will handle up to 300 hundred horsepower. However the 4A-GZE fuel injection system becomes marginal around 12psi of boost. I think a Garret T-25 turbo from a second gen talon/eclipse would be an excellent choice for a good power band. If you are low on cash you could try using a turbo from some of these cars: 84-88 200SX turbo, 84-86 Sunbird GT turbo, Isuzu Implulse, Geo Storm. These motors are all SOHC 1.8L motors. The exhaust flow from the 4A-GZE should spool up their turbos quickly, but not so quickly as to cause exhaust back up at high revs. This would give you an excellent street engine.
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