It modifies your shift points for a more "Sportier" setup. I don't really know how much of a diff. it actually makes. When my car had an Auto trans...I just ran w/ it in Sport mode all the time.
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1987 N/A MA70 Supra <--1JZ swap in progress
1986 AE86 GT-S Hatchback
2002 DC5 RSX Type S
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