Hi think that when we are talking about 0.5 seconds to 60 or even 1 sec difference,and even mid range comparisons pound for pound performance figures you cannot beat a E55 kompressor engine even compared to todays best performance saloon cars! no history of head bolt problems, camshaft problems, i like to sleep at night not worrying about my engine blowing up and costing thousands for a rebuild! my m113 is bullit proof and is proven so! M113 engine all day long, higher the engine revs the sorter life span fact! and to be fair who rates themselves to get the the so called manufactures figures for performance??
most owners cannot drive these cars to there full potential!
and in the long term sound is one thing but engine reliability and cost of ownership comes first in my book, time will tell but id put money on that there will still be a lot more M113 engines about than m156 in 10 years time! only my opinion of course