I have a 98 Audi a4 quattro 1.8t (blue)
Currently I have 168k miles and some cosmetic changes. I have h.i.d head lights (low and high beams) thinking of getting leds instead, I have black housing headlamps, 17' gli wheels and new tires, and I got my ball joints and control arms replaced.

So my problems are my exhaust has a hole in it, my passenger window doesn't work, and my transmission acts up sometime. Like steady driving my rpms move up and down so its not steady and has minor slip.. my windshield has a crack and other normal issues. Abs brake and airbag light is on and its auto...

Should I fix the issues or buy a newer car?