Note that those gear ratio changes are more suitable for boosted S54s since you will have more power and torque in general and can move the car easier.
1st gear will be much much more usable when dragging/lapping with much much less amount of tyre slip. it will be harder to drive around stop and start traffic though, since 1st gear will need you to slip the clutch a bit more to get the car moving.
Ofc, if the cost is as high as a brand new gearbox, opting for a samsonas dogbox would be a smarter choice, if not, you will probably need to open up your gearbox and rebuild it yourself. but hey, better to have ZF provide you the gears rather than having to fabricate them yourself.
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