Both the Challenger and the G8 came in various models with different engines and performance options. A base model Challenger would be significantly slower than a high-performance G8 GT, for example. Conversely, a high-performance Challenger SRT8 would likely be faster than a base G8.
To get a meaningful comparison, you'd need to specify the exact trim levels (e.g., Dodge Challenger SE vs. Pontiac G8 GT, or Dodge Challenger SRT8 vs. Pontiac G8 GXP) and then look at their 0-60 mph times and quarter-mile times from reputable sources like automotive magazines or websites specializing in car performance.
