The E92 M3 features an ESS Tuning VT3 built motor setup with power in the mid 600 wheel range on race gas. Unfortunately, this is a very weak example of a built motor M3 due to the block not being sleeved. It is simply a stock block with a dropped compression ratio for longevity purposes which prevents "accidents" from happening on the stock internals. It really does not offer much of a power benefit over a stock internal car as the compression ratio drop means more air needs to be compressed to make up for the lost power per psi of boost.
It uses the exact same Vortech blower as the standard ESS kits which is undersized for a true built motor setup. A properly built low compression M3 with a properly sized blower should not lose to a stock internal M156 on a 91 octane and should not be in the 6XX wheel horsepower range. Regardless, what happened is what happened and the Weistec Stage III setups continue to impress as this C63 beats "the best" ESS has to offer and has been seen simply walking away from some very quick cars. Much respect to Wesitec on their build and checking egos, video below.