"Easy mod" to get a little more fresh engine?

[Tireiron]

Originally Posted by 'E'

Rallispec do a 5th and 6th (.707) conversion kit for us$360 or you can get jdm forrester ty856wl4cc/7cc/8cd or legacy ty856wlfaa Sti boxes (for under au$1000 + shipping) which all have .707 6th gear and a transfer of 1.00 which means our 3.9 r160 diffs can be used, most of the US 6 speeds have a .756 6th gear but run a 1.1 transfer and a 3.545 rear diff giving a final drive of 3.9 later model US legacy have a .666 and .695 but run a 4.111 final drive

US market STi 6MT (easiest to find from part outs of kids smashing them up in the US)
04-05 3.9 final with 1:1 transfer (uses 3.9 rear diff)
06-07 3.9 final with 1.1:1 transfer (uses 3.54 rear diff) only 2 years with 1.1:1
08+ 3.9 final with 1:1 transfer (uses 3.9 rear diff)