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The main difference is the engine. While both versions use 1.6liter Toyota Engines, the GSI is a DOHC engine, a version of the 4-AGE engine used in the 1st generation MR2 and the top of the line Corollas, and JDM Sprinters of the 80's. known for high revs and being a blast to drive. I had an 87 mr2, got 35MPG and ran like a go cart!! The interesting thing is that this is the highest HP version of the 4-AGE that was ever released in America, at 130hp, MR2/Corolla versions were 116hp, (japanese 20valve version makes like 170ish?), and it is not in a toyota, it is in a GEO who would think? The Corolla and MR2 stopped using this engine in 89, but the GEO kept it going another 3 years. Cool car, I hear it is quick, especially with the 5spd, and I have been lokoing for one, but they are rare.

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16y ago
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Q: What is the difference between 1991 geo prizm and a 1991 geo prizm gsi?
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