Curb weight on the 16v is right at 3klbs and it's the heaviest.
The 2.6 is right at 2900lbs.
The 1984 US Spec, no options 2.3 IIRC is listed in the manual as 2395lbs.

300-900lbs isn't that much, right?
FWIW the 190E Chassis is just as competant as the sport coupe chassis.

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1993 190E 2.6 Sportline