2008 E350 suspension
#2
MBWorld Fanatic!
Springs. All E V6's 2007 and up don't have air suspension (not even as an option). Mine is an 04 and I had the option. Only the V8's have them. Also, the new E550 coupe doesn't have air suspension either (only the 550 sedan).
#4
MBWorld Fanatic!
I really don't have any knowledge of that stuff since my car has the air suspension (airmatic). Try a search and you can find a lot of stuff on lowering and such. Welcome to the forum btw.