Never Buy Someone Else’s Build Unless It’s This 500-HP Manual-Swapped 2007 Mercedes-Benz E63 AMG Wagon

Used cars are always a gamble, but the stakes climb off the chart when you buy someone else’s unfinished project. What if the car you crave was never sold in the exact spec you want? You could spend months and thousands trying to build it yourself—or you could take a shortcut with this 2007 Mercedes-Benz E63 AMG wagon on Cars & Bids, a one-off that swaps the factory automatic for a six-speed manual and adds 507 HP from its naturally aspirated 6.2-liter V8.

Mercedes never offered a manual in the wagon, so this car is already a unicorn; the transmission itself is a six-speed unit pulled from a 2005 SLK350, a donor that made only 268 HP, raising questions about long-term durability under 500 HP. The seller insists the gearbox is up to the task and points to a “very good friend familiar with these cars” for any future work—meaning there’s no dedicated shop to call if things go sideways. Beyond the shifter, the build piles on a custom driveshaft, upgraded throttle plate, AMG Black Series engine mounts, a new catch can, exhaust resonator delete, lowering links for the air suspension, and 19-inch staggered BBS LM wheels.

A subtle carbon-fiber aero kit, an AMG Black Series steering wheel, a fresh sound system, and a new head unit with Apple CarPlay round out the mods, while the dual-zone climate control still works—a rare feat after this much tinkering. The original wagon also came with a power sunroof, driver’s seat memory, rear sun blinds, and rear-facing third-row seats that promise endless family fun. With only 153 S211 E63 AMG wagons sold in the U.S., manual-swapped examples are vanishingly rare, and bidding has already rocketed past $20,000 with six days left on the auction.

You’ll need serious cash to win, and you’ll still want to budget for a set of Monoblock wheels to finish the look, but if you shuffle the finances you could soon be rowing your own gears in a naturally aspirated E63 AMG wagon that defies factory logic.