The AMG mod was to bore out the 2.6 to 3.2 litres as I recall. This was done on selected 2.6 blocks. Boring the 3 litre wasn't possible because the bores are siamesed i.e no water passages between adjacent pairs of cylinders. The 190 E 3.2 AMG was the first model sold through Mercedes-Benz dealerships with Mercedes-Benz new car warranty. About 200 complete cars were made, in black or silver: they were very expensive (about $90,000). Besides 200 complete 190 E 3.2 AMG's, Mercedes-Benz sold AMG body kits and 3.2l AMG engines separately, so there are 190's fitted with those features from factory or afterward. Sporty 190E 3.2 AMG straight-six 12 valve engines produced 234 bhp (174 kW), and reached 260 km/h (162 mph). Knowing AMG they will have probably used a piston from the MB "parts bin" of the time like they used a modified diesel engine crank for their 3.6 M104----- so a bored out 2.6 might be the basis of a modified car???