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I had the mechanical indentical 155 2,0 16v some year ago (and now a 156 2,0 which have same engine/transmision), and I don't remember what you discribe.
As you write, it can be a overly noisy exhaust or it's badly aligned or leaking.
It can have too small wheels and tires, standard fitments was 195/55-15 or 205/45-16 (alu) and at 4000 RPM the speedo should show about 135 km/h - it does about 33,5 km/h per 1000 RPM in 5. speed
These models had a engine mounts weakness, so maybe you need new ones.
If non of this is the chase, check for missing grommets for cables thru the boulk head or missing noise isolation.
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