E320 1996 will have the same M104 inline 6 as salarzaes car and will produce 231hp, the V6 came into being in the beginning of 1998 in he E-klasse. It's possible that geran spec engines produce less power due to emissions standards, but UK an swiss 3.2L M104's produce 231.
First facelift happened in 1998 (very minor changes like LED 3rd brake light and 1 piece roof linier)
Major facelift came in mid-early 2000.