I just removed nearly 300 pounds from my GT. (not original 300 pounds half of that is from the aftermarket sound system that was in it two subs amp all the wire) but anyways it is a night and day difference I couldn't believe how much quicker it felts maybe it was in my mind? but it felt like a huge difference also a little louder without the rear seats now ha
Is this your only car? If so, is it really worth it to sacrifice nice street manners ( noise reduction, good enterainment system) for "slightly" better performance at the track?
In my opinion, the days of sacrificing the street ability of your daily driver and turning it into a rolling tourture chamber by ripping out seats, noise insulation, AC, heat, stereo and installing solid mounts, bushings, etc is old school.
Thanks to modern technology, yesterday's rolling tourture chambers have given way to cars with full and insulated interior, all the seats, AC, Heater, DVD, navigation, nice and quite exhaust and a smooth suspension that wont beat you to death that run 10's and quicker.
Do it right and you can have it all.