The 185, 205, 215 etc. are all structurally the same engine, the difference is that the 185 is single turbo and the others are two stage turbo and some other ancillary/peripheral differences.
If you have to choose between two similar cars, the 205 (twin turbo) is a definite improvement on an already good engine.
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2011 XC90 D5 Executive
2003 C70 T5 GT
2012 Ford Ranger XL SC
1977 Triumph Spitfire 1500
1976 Massey Ferguson 135
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