Gearbox:

1.gear: 2,95 : 1
2.gear: 1,94 : 1
3.gear: 1,34 : 1
4.gear: 1 : 1
5.gear: 0,8 : 1

Diff 7,5" : 3,64

Seen quite a few changing to diffs with 3,92 ratio..

205/40-17, 7000rpm, 3,64 diff : 167,7mph
205/40-17, 7000rpm, 3,92 diff : 155,4mph
205/40-17, 7000rpm, 4,29 diff : 142,3mph

5.gear on a T5 box on the results listed above.