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That max speed limit might be due ECU firmware limiting max speed and not letting for throttle to be fully open after said gear/rpms (no clue, if it can be fixed with tune or not). While you'll improve acceleration (in 6th and other gears) to get there, max speed itself will be even lower, due you reaching those rpms at lower speed due different final drive ratio. As in normal legal daily driving or on track with lot of corners and not too much straights one can rarely reach max speed, for most final drive install is worth it. If you reached max speed even on stock final drive, then maybe it's worth reconsider to install it or not, if max speed matters more then acceleration to get there ..
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