Porsche 911 GT3 vs. BMW M4 CSL

iSeeCars' unbiased and data-driven comparison of the Porsche 911 GT3 and BMW M4 CSL contrasts the two cars across a broad spectrum of vehicle specifications to determine which car is better. In addition to comparing pricing and specs, iSeeCars uses all the ratings, rankings, and insights from its comprehensive analyses of each vehicle model, including calculations of reliability, safety, depreciation, value retention, and the vehicle's projected lifetime recalls (based on analyzing over 25 billion data points). This in-depth evaluation is used to identify which vehicle represents a better overall choice for shoppers who are considering both the Porsche 911 GT3 and the BMW M4 CSL.

When comparing the Porsche 911 GT3's and the BMW M4 CSL's specifications and ratings, the Porsche 911 GT3 has the advantage in the areas of reliability, resale value and overall quality score. The BMW M4 CSL has the advantage in the areas of typical lower range of pricing for one- to five-year-old used cars, and fuel efficiency and base engine power. Based on this comparison of the Porsche 911 GT3's and the BMW M4 CSL's specifications and ratings, the two cars are fairly comparable.

Pricing: A used 2023 Porsche 911 GT3 ranges from $254,739 to $300,927 while a used 2023 BMW M4 CSL is priced between $119,359 to $147,018.

Resale/Retained Value: Looking at the 5-year depreciation rate for both models, the Porsche 911 GT3 loses 8.3 percent of its value and the BMW M4 CSL loses 40.9 percent of its value. This means the Porsche 911 GT3 retains 32.5 percentage points more of its value and has the advantage of higher resale value versus the BMW M4 CSL.

Quality Rating: The iSeeCars Overall Quality rating for the Porsche 911 is 9.2 out of 10 while the BMW M4's quality rating is 7.6 out of 10. This results in the Porsche 911 being ranked 1 out of 41 Best Luxury Sports Cars and the BMW M4 being ranked 22 out of 41.

Reliability Rating: iSeeCars’ Reliability Rating for the Porsche 911 is 8.4 out of 10. For the BMW M4 the reliability rating is 7.2 out of 10. This gives the Porsche 911 an advantage in reliability compared to the BMW M4.

Engine Power and Fuel Efficiency Comparison: For engine performance, the Porsche 911 GT3’s base engine makes 502 horsepower, and the BMW M4 CSL base engine makes 543 horsepower. The GT3 is rated to deliver an average of 16 miles per gallon, with a highway range of 304 miles. The CSL is rated to deliver an average of 18 miles per gallon, with a highway range of 359 miles. This gives the BMW M4 CSL the fuel efficiency and maximum range advantage over the Porsche 911 GT3. Both models use premium unleaded.