Bill,
I originally bought that STi 6-speed for my SVX. Eventually we decided it would be better if we used it in the L, since it provided better gearing and near-indestructibility for future power mods.
Now, our Impreza also has giant Stoptech front brakes, STi rear brakes, '05+ STi hubs, axles, R180, etc. so it's also 5x114 like the SVX.
I haven't updated the site in a while, but the L recently ran a
12.45@109 before we swapped to a bigger motor. The car should be a bit faster than that after our road tune this Tuesday. We are now using a hybrid 2.5L with 2.0 WRX heads and a quick-spooling turbo to get a wide, auto-x-friendly powerband peaking around 350WHP on pump gas. The car had 320WHP when it ran 12.45 at Mason Dixon.