Sport box to standard 325ise box

[chief]

i have a g' reg 325i SE
&
was gonna change diff to give a much nippier acceleration but a 4.1 seems expensive
so
i'm interested in a sports gearbox to help give a bit of a boost through the gears
i am really interested in the ratios of both boxes
maybe there is another gearbox that would fit and give a similar or better result
any other tips would be great

[M5pilot]

The 320i gearbox ratios are more towards the sport box - very good.

The sport box is the one to go for though.

[JOSEMI]

Why the 320's box are closer to the sports than the 325's ? I would think that, 325 being bigger and more responsive would have to bear a sportier box ?? Just curiosity as I have a 320, although it does feel very accurate a box...