The bias and pistons sizes, are close enough IMO, but it does go forward slightly. The rear 08+ sti calipers use 40mm pistons, which is the same size as the stock calipers (well, almost, stock are 40.5). The older 04-07 rear brembos only have 36mm pistons though and would not be good to use.
This, however, should be more of a cause for concern:
Quote:
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Subaru WRX STI calipers are made to be mounted in the trailing position (behind the axle). If mounted in front of the axle, by exchanging positions of the plugs and bleed screws on the caliper, it is not possible to bleed all the air out of the system because the fluid crossover in the caliper is the highest point and will trap air.
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However, a number of people have done it and seem to have been able to bleed the brakes?
Also, that article's figure of a 25% increase in front brake force is not what I come up with. The total brembo piston area is only 1.5% more and the total change in brake force about 10%
The total bias I get for stock brakes is 68.3:31.7 and with brembos 69.9:30.1, so about a 2% shift. The proportioning system works the same on both cars, providing even brake pressure front and rear until a speed difference begins to occur.