* Modifications: Any modifications to the engine, exhaust, or intake will drastically affect RWHP. A completely stock car will have a lower RWHP than one with performance upgrades.
* Dyno used: Different dynos measure horsepower differently, leading to variations in results. A dynojet will typically show different numbers than a mustang dyno, for example.
* Conditions: Ambient temperature, humidity, and even the altitude can all impact the results.
Therefore, there's no single definitive answer. A completely stock 2007 Mustang GT will likely put down somewhere in the range of 280-300 RWHP. However, this is just an approximation. To know the exact RWHP of a specific car, you'd need to have it dyno-tested.
