The W212 E63 is the last AMG sedan that feels like it was built by people who were genuinely angry at the road — and I'll die on this hill. That M157 biturbo V8 doesn't just make power, it makes a statement every time you crack the throttle in a parking garage. But here's where most builds go sideways: people bolt on a downpipe tune and call it a day while the MCT transmission is quietly plotting its revenge. That 7-speed is brilliant when it's healthy and catastrophic when it's ignored. Budget for the conductor plate and valve body before you even think about pushing past stock power. The real move is building these in order — intake, downpipes, a proper E85 tune on the M157 gets you into the 650+ territory without turning the motor into a grenade. Then you address the suspension because the factory airmatic is either perfect or actively trying to strand you at a gas station, no in-between. Wheels are where most W212 owners fumble the bag. This chassis demands a staggered setup tha...