i stripped loads out of mine and dropped nearly half a second instantly, took the back and front pass seats out, only did one run and as above, knocked nearly a half second off instantly, compared to the runs on the same day.
just bought a crx for fun/track/quarter miles and that will be getting completely stripped out!
at the end of the day though if its your daily drive you have to live with, i couldnt live with my dc5 stripped out, i would take the back seats out for track days etc but always put them back in afterwards, its only a five minute job though
as you know i also had a carbon bonnet and the difference in weight was unreal, also had the titanium cat back, now that weighed no more than a few coins!!! every little helped!