aspiration

Hey people I thought that the CLC 160 was a 1.6 naturally aspirated and the 180 Kompressor was a 1.8 supercharged and the 200 was a 2 litre supercharged But after some net searching it seems that they are all 1.8 superchaged So what are the differences in the 3 apart from power output ????

I own a E350 CDI Coupe Sport, 59 plate, had it 11 months and put 20k on it. The engine sometimes seems to struggle to aspirate itself when at normal running temp. It occurs when you blip throttle on standstill - sounds like the hoses / pipes are struggling to draw air in.... Has anyone else...