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'01 2.5RS STM Sedan
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As others mentioned, there are baffling differences in the tanks. The stock 93-01 fuel tanks have poor baffling. Upgrading to a turbo fuel tank (WRX, STI, FXT, they are all identical fuel tanks) from a 02+ car is a worthy upgrade to mitigate this.
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One thing unique however to the STI was the inclusion of a box for the pickup tube, which also acted as a secondary baffle. This can also help improve any issues regarding fuel starvation.
 
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