i dont have the code for an 05 SPEC-C RA, but the ratios are (6MT):
1st 3.636
2nd 2.375
3rd 1.761
4th 1.346
5th 1.062
6th 0.842

3.9 final drive, 3.545 rear diff.

ditto this for 2010 spec-c and all the c-spec/vlims/s-clubs prior

the 05 forester sti is
6.636
2.235
1.521
1.137
0.891
0.707

3.9 final, 3.545 rear.

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Long live the WRC