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Last time out, Project RSC received a handful of basic bolt-ons, including a throttle body and plenum, a set of underdrive pulleys, and a custom chip. When tested at Powertrain Dynamics, the 200,000-mile 4.6 pumped out 209 hp at the wheels. Despite running on a DynoJet chassis dyno at both places, the power was down to just 199 hp in baseline form at MagnaFlow. We can't explain the difference in power between the dynos, but the new numbers repeated three times in a row and are a perfect example of why we reestablish a new baseline before we start swapping parts.