The different between 5, 6 & 9-drive.
5-drive (16-bits) got 5-modes & 37 adjustable steps:
Eco mode: EC.1~9 (AT & MT)
Normal mode: Normal (stock mode)
Sport mode: F1.1~9 (AT & MT)

(2 years warranty*)
6-drive (16-bits) got 6 modes & 46 adjustable steps:
Eco mode: EC 1~9
Normal mode: Normal (stock mode)
Sport mode AT: HA 1~9
Sport mode MT: HH 1~9
Racing mode AT: FA 1~9
Racing mode MT: FH 1~9

(3 years warranty*)
9-Drive (32-bits) got 9 modes & 73 adjustable steps:
Eco mode: EC 1~9 (AT & MT)
Normal mode: Normal (stock mode)
Sport mode: F1.1~9 (AT & MT)
Racing modd: F2.1~9 (AT & MT)
Racing+ mode: F3.1~9 (AT & MT)

(3 years warranty*)
5 & 6-Drive using 16-bits microchip.
9-Drive using 32-bits microchips. (Double the response speed & more stability)
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