That 5th gear is no good whatsoever even a 650+ Cossie cant pull it.
It will give you a theortical Topspeed past 214mph @ 7500rpm on 215/40/17
You can get a .83 5th gear for a TKO so I expect its available for the 3550 thats is within 3% of a T5 .

Below will give you the speeds @ 7500 on 215/40/17 using 3.64 diff

!st 45mph
2nd 74mph
3rd 109mph
4th 146mph
5th .68 214mph
5th .83 176mph