Well, I think my 135i is a lighter car compared to 1M. Maybe because of its tires or wider susp, I don't know.
I went to BMW M Tour last month and drove 1M after M3 E92. Ok, 1M is 6MT, ligther, almost 80hp less than M3 and its faster too.
The point is: I don't think 135i and 1M is feels heavy. I have one Alfa Romeo 145 and its 2734lbs. This is heavy for a 90's hatchback. M3 is heavy, but don't feel heavy.
Ok, we need lighter cars and I think 3000lbs is the point to 1M and 3200 is top weight for M3.
135i Sauber F1 Team - Brazil Edition