I would love a lightweight rear deck sub. Right now I have a 12" in a particle board box that I never have in the car because it kills trunk space and it's too heavy to race with anyway. But, I really miss it because my 4.5" speakers are obviously completely incapable of creating any bass. So if you could get a nice, light 6" or 8" sub that would add negligible weight (after removing material for it to fit in), for a reasonable price (a $75-$100 speaker is good enough for me), I would be very interested.
