95 c280 issues

Got this car 2 weeks ago, like it very much but I've noticed some issues:
1) It's loud. Does this model have a complex exhaust system? the sound is kind
of sporty, but I'm sure it will grate on me over time
2)tachometer and fuel gage quit working. Are these hard to fix?
3) power headrests dont work 4) LH headlight wiper motor not working 5) the ride is very very rough. I'd driven one of these before and it was much more refined than this one 6) shakes at over 60mph but I think this is because the tires are out of balance
Anyway, the wipers and headrest motors are pretty minor. But the suspension and noise issues do give me some pause
Has anyone dealt with any of these things?
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