Performance Testing the Borla Cat-back Exhaust on a 2004 Pontiac Gto: Real Results

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The 2004 Pontiac GTO is a classic muscle car that has garnered a loyal following over the years. One of the most popular modifications among enthusiasts is the installation of a high-performance exhaust system. In this article, we will delve into the performance testing of the Borla Cat-back Exhaust on a 2004 Pontiac GTO, providing real results and insights into its impact on performance.

Introduction to the Borla Cat-back Exhaust

Borla is known for producing high-quality exhaust systems that enhance both performance and sound. The Cat-back exhaust system is designed to replace the factory exhaust from the catalytic converter back, improving exhaust flow and reducing back pressure. This can lead to increased horsepower and torque, as well as a more aggressive exhaust note.

Testing Methodology

To accurately assess the performance gains from the Borla Cat-back Exhaust, we conducted a series of tests under controlled conditions. The following steps outline our methodology:

  • Baseline Dyno Test: We first measured the stock GTO’s horsepower and torque on a dynamometer.
  • Installation of Borla Cat-back Exhaust: The exhaust system was installed according to manufacturer’s specifications.
  • Post-Installation Dyno Test: We performed another dyno test to measure the performance after the installation.
  • Sound Level Measurement: We recorded the sound levels at idle and under acceleration.

Baseline Performance Results

Before the installation of the Borla Cat-back Exhaust, the 2004 Pontiac GTO exhibited the following performance metrics:

  • Horsepower: 350 hp at 5,200 RPM
  • Torque: 365 lb-ft at 4,000 RPM
  • Sound Level: 78 dB at idle

Performance After Installing Borla Cat-back Exhaust

After installing the Borla Cat-back Exhaust, we conducted another set of tests to evaluate the performance improvements:

  • Horsepower: 375 hp at 5,200 RPM
  • Torque: 375 lb-ft at 4,000 RPM
  • Sound Level: 85 dB at idle

Performance Gains Analysis

The results indicate a noticeable improvement in both horsepower and torque after installing the Borla Cat-back Exhaust. The horsepower increased by 25 hp, while torque saw an increase of 10 lb-ft. This demonstrates that the Borla system effectively enhances the engine’s performance characteristics.

Sound Quality and Characteristics

In addition to performance gains, the sound produced by the Borla Cat-back Exhaust is a significant factor for many enthusiasts. The exhaust delivers a deep, aggressive tone that enhances the driving experience without being overly intrusive.

Conclusion

The performance testing of the Borla Cat-back Exhaust on a 2004 Pontiac GTO reveals substantial gains in horsepower and torque, alongside an improved exhaust note. For GTO owners seeking to enhance their vehicle’s performance and sound, the Borla Cat-back Exhaust is a worthy investment.

Recommendations for GTO Owners

For those considering the Borla Cat-back Exhaust, here are some recommendations:

  • Ensure proper installation by a qualified technician to maximize performance gains.
  • Consider pairing the exhaust with other performance upgrades, such as a cold air intake or performance tuning.
  • Regularly check for exhaust leaks to maintain optimal performance.

Further Reading and Resources

For more information on performance modifications for the Pontiac GTO, consider exploring the following resources: