The 94 + update looks good in my opinion, but the E420 or 400E is not just an E320 or 300E with a V8. Brakes, suspemsion and transmission are all upgraded to handle the extra power. Interior trim is also upgraded. Just because the numbers are different doesn't mean much, both the 400 and 420 had the same 4.2l engine.

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Jason Priest
1999 E430
1995 E420 - retired
1986 420SEL - retired