603 MTech Autowerks

This E63 AMG came into the shop looking for one thing more power. The owner chose the full RENNtech R1 Package along with RENNtech catted downpipes to wake up the M177 twin turbo V8. We also installed the RENNtech Blow Off Valve Upgrade, Exhaust Valve Module, and Hand Held Tuner to complete the package.

The result? Around 800 horsepower with incredible throttle response, aggressive sound, and factory-like drivability. Before adding performance upgrades, we always make sure the engine is healthy. A solid foundation is the key to reliable power.

Would you keep your E63 AMG stock, or build it to 800 horsepower?

Diagnostic fees are something certain people don’t like to pay, especially when they feel like they already know the answer. But a misfire doesn’t automatically mean spark plugs. It could be a coil. But on certain engines, it could also be something much more serious, like cylinder wall scoring, which basically means the engine needs to be replaced.

That’s why a proper diagnosis matters. We’re verifying the failure, checking the system, and making sure your money goes toward the right repair. A proper diagnosis can save you from replacing parts you don’t need and help catch bigger issues before they become a much bigger problem.

This E63 AMG is already making around 720 wheel horsepower with a Stage 2 tune.

We’re installing over $10,000 in upgrades including VRP exhaust manifolds, an Armaspeed carbon fiber intake, and a VRP billet intake manifold to improve airflow and support more power from the M177 platform.

While we’re in there, we’re also replacing the engine mounts and oil separators as preventative maintenance.

Once everything is installed, the Mercedes will be heading back to the dyno for a custom tune. The owner’s ultimate goal is 800 wheel horsepower with a future high pressure fuel pump upgrade.

Do you think it will have 800 wheel horsepower?