2002 WRX:
Gear Ratios
1 : 3.454:1
2 : 1.947:1
3 : 1.366:1
4 : 0.972:1
5 : 0.738:1
Final drive : 3.9:1
2004 STI:
1st: 3.636
2nd: 2.375
3rd: 1.761
4th:1.346
5th:0.971
6th: 0.756
Final drive : 3.9:1
So My STI is 2.4% higher ratio than my WRX was if I have the right ratios and did the math right, so I was high in my estimate.

Still, That should be 72RPM at 3000RPM and basically 100 at 4000. Doesn't seem like much but I sure noticed the drop when I changed cars. The WRX just sounded like it was whining down the road at 70+.
What is interesting is how 5MT 4th is almost identical to 6MT 3rd.