IIRC, the first turbo'ed Subaru's ran a mere 6lbs; with the added weight of the turbo system, the naturally aspirated Soobs w/the same motor/tranny would out run the turbo Soobs!
Of course, that was pre-86. In '86 they introduced the XT Turbo. 7-8lbs stock and whoosh.
Anyway, yeah, I'd recommend you stick to asethetics.