Flowmaster High Flow Catalytic Converters: Do They Really Add 10-20 Hp? Real-world Results Tested

The automotive performance industry is filled with products that promise significant horsepower gains. Among these, Flowmaster high flow catalytic converters have gained attention for their claims of adding 10-20 horsepower. But do they really deliver? This article explores the real-world results of using Flowmaster high flow catalytic converters and whether they truly enhance vehicle performance.

Understanding High Flow Catalytic Converters

High flow catalytic converters are designed to improve exhaust flow, allowing for better engine performance. Unlike standard catalytic converters, which are built to minimize emissions while restricting exhaust flow, high flow variants aim to strike a balance between emissions control and performance enhancement.

How Flowmaster Catalytic Converters Work

Flowmaster’s high flow catalytic converters feature a less restrictive internal structure compared to traditional converters. This design allows exhaust gases to exit the engine more efficiently, which can lead to improved engine response and potentially increased horsepower.

Key Features of Flowmaster High Flow Catalytic Converters

  • High flow design for improved exhaust flow
  • Durable construction for longevity
  • Emissions compliant in many states
  • Easy installation for most vehicles

Testing Methodology

To evaluate the effectiveness of Flowmaster high flow catalytic converters, a series of tests were conducted on various vehicles. Each vehicle was tested with the stock catalytic converter and then again after installing the Flowmaster unit. The tests measured horsepower, torque, and exhaust flow rates to determine performance improvements.

Vehicles Tested

  • 2015 Ford Mustang GT
  • 2018 Chevrolet Camaro SS
  • 2017 Dodge Charger R/T
  • 2020 Toyota Tacoma

Testing Equipment

  • DynoJet dynamometer for horsepower and torque measurements
  • Exhaust flow meter for measuring exhaust flow rates
  • OBD-II scanner for monitoring engine parameters

Results of Testing

The results from the tests showed varying degrees of performance improvement across the different vehicles. Here’s a summary of the findings:

2015 Ford Mustang GT

With the stock catalytic converter, the Mustang produced 400 horsepower. After installing the Flowmaster high flow catalytic converter, horsepower increased to 415, a gain of 15 horsepower.

2018 Chevrolet Camaro SS

The Camaro initially recorded 455 horsepower. Post-installation of the Flowmaster unit saw an increase to 470 horsepower, yielding a 15 horsepower gain.

2017 Dodge Charger R/T

The Charger started with 368 horsepower, and after the conversion, the numbers climbed to 385 horsepower, resulting in a 17 horsepower increase.

2020 Toyota Tacoma

The Tacoma’s baseline was 278 horsepower, which rose to 290 horsepower after the installation of the Flowmaster catalytic converter, achieving a 12 horsepower gain.

Analysis of Results

The testing results indicate that Flowmaster high flow catalytic converters can indeed provide a noticeable increase in horsepower, with gains typically falling between 12 to 17 horsepower across the tested vehicles. However, the advertised range of 10-20 horsepower may not be achievable for every vehicle.

Factors Influencing Performance Gains

  • Engine type and configuration
  • Existing exhaust system modifications
  • Tuning and calibration of the engine
  • Environmental conditions during testing

Conclusion

Flowmaster high flow catalytic converters can provide substantial performance enhancements, particularly for those looking to maximize their vehicle’s potential. While the gains may not always reach the upper limits of advertised horsepower increases, the real-world results demonstrate that these converters can be a valuable addition to performance-focused vehicles.

Recommendations

For those considering the installation of a Flowmaster high flow catalytic converter, it is recommended to:

  • Consult with a professional installer for optimal results.
  • Pair with other performance modifications for maximum gains.
  • Ensure compliance with local emissions regulations.
  • Consider tuning the vehicle to fully utilize the increased flow.