* Vehicle: The make, model, and year of the vehicle significantly impact the results. A performance car might see a small gain, while an older vehicle might see little to no change or even a slight decrease.
* Specific Magnaflow System: Different Magnaflow exhaust systems are designed for different applications and will yield different results. A cat-back system will likely produce different results than a full exhaust system.
* Other Modifications: If the vehicle has other performance modifications (intake, tuning, etc.), the exhaust system's impact will interact with these changes.
* Testing Methodology: Dyno testing, which is how horsepower gains are typically measured, can produce varying results depending on the equipment and testing conditions.
Instead of focusing on a specific horsepower number, it's more accurate to say that Magnaflow exhaust systems are designed to improve exhaust flow, which *can* lead to a slight increase in horsepower and torque in some applications, along with improved engine sound. However, this improvement is often subtle and not always measurable. Many users report gains more in terms of improved throttle response and sound than in significant horsepower increases.
