Sound deadening can make a huge difference in updating the car to feel more modern and enhance stereo enjoyment, but it also adds considerable weight so it depends on your driving style and ambitions. Others can give you better advice on how to/where. I just know that I've been in mk2s with sound deadening and it can make a big improvement.
Your sunroof tray is probably fine, but you should clean out or probably even replace the drain tubes. Its only when those clog up or kink that it leaks from basically filling with water till it overflows.
I'd pull all the window tracks, clean the ancient hardened goo out of them and re-lube and replace any worn components. You'd be surprised how much faster you can make the windows operate like new.
I'd also be inclined to install new speakers. I'd also inspect the seatbelt retractors and try to make sure those operate smoothly. Make sure the gas door and hatch release cables are good and operate smoothly.
And search for some posts by Suprafiend regarding body seam sealer and rust repair. He pretty well documented all the places the water gets inside from sloppy workmanship and design flaws and gave some tips how to fix it.
That's all that I can think of off the top that's maybe not "obvious".
Your sunroof tray is probably fine, but you should clean out or probably even replace the drain tubes. Its only when those clog up or kink that it leaks from basically filling with water till it overflows.
I'd pull all the window tracks, clean the ancient hardened goo out of them and re-lube and replace any worn components. You'd be surprised how much faster you can make the windows operate like new.
I'd also be inclined to install new speakers. I'd also inspect the seatbelt retractors and try to make sure those operate smoothly. Make sure the gas door and hatch release cables are good and operate smoothly.
And search for some posts by Suprafiend regarding body seam sealer and rust repair. He pretty well documented all the places the water gets inside from sloppy workmanship and design flaws and gave some tips how to fix it.
That's all that I can think of off the top that's maybe not "obvious".