Why was the 5 cylinder used in the 4000 Quattro and coupe after 1985 if it gave only a 6 hp increase over the I-4? The extra weight must have eaten the advantage away. Jeremiah Curry '84 Coupe GT (2.1 L) >1985-87 4000S,CS 1.8L I4 8V 102hp high compression >1985-87 Coupe GT 2.2L I5 10V 110hp