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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.
Erik
 
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