subiekid: I dont agree that the suspension items cost more. Basically 80% of the running gear on my legacy is Impreza items! Just as an example I have an impreza transmission, impreza brakes, impreza wheels, impreza strut tower bar, and impreza struts. The only item difference is the sway bars, but only in the rear for most brands.
From what I know a legacy sedan 4wd is between 2900 and 3100 pounds, an Impreza should be between 2600 and 2900.
So basically the 500 pound difference is comparing a stripped impreza to a fully loaded legacy, that makes sense.