Re: 1999 Mercedes E320 - Same engine as Crossifre?
The '99 E320's came with the same M112 motor that is in the N/A Crossfire. The Electronics are different though and it uses an ME2.0 vs an ME2.6 ECU. This may mean that a tune could be hard to come by but the rest of the stuff should work provided it physically fits.
BTW, you have a PM.