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This would be assuming that everything is done right, and no corners are cut during the swap.
 

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how could you skip corners???? its just a direct drop in! i guess if u ran with the butterflys closed or open all the time it might not use gas appropriatly. But i dont think it would make that much of a diffrence.
 

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My SPI gets about 10 mpg less (28 vs 38 ) than the 1.9 got. It might have something to do with my secondaries not being hooked up yet but who knows.
 
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