Thanks for the info. More details:
http://www.zpost.com/forums/showthread.php?t=1011279
Seems like there is no other upgrade option for the 3.0si
Doing some further reading (theoretical, yes):
http://stoptech.com/technical-suppor...brake-upgrades
- Adding sticker tires decreases rear brake bias due to more weight successfully transferred forward
- 2J swap added an additional 100lbs to the front, decreasing rear weight bias
All said and done, perhaps just upgrading the front might only upset the bias by a small amount. I may have no choice but to just purchase brand new rear rotors of the same kind, and see how this does on the road coarse.