Associate Editor Byron Hurd introduced the official Subaru performance accessories that were installed on the 2023 Subaru WRX. The most anticipated addition was the STI muffler, which was expected to enhance the driving experience. However, the initial impression was not great, as the muffler produced an extremely boomy sound during the high-rpm cold start routine. This resonant humming was especially noticeable in the 1,000 to 2,000 rpm range, disrupting the morning quiet inside the cabin.
After driving several hundred miles, the overall volume of the muffler did decrease slightly, indicating that it had “broken in.” Despite the persistent boominess, there were some positive aspects to the muffler. The exhaust tone was clean and deep, with a satisfying lumpiness characteristic of a boxer engine at warm idle. The increased volume also enhanced the rev-matching experience and added an element of fun when driving the car aggressively.
One of the key advantages of the muffler was its civility on the highway. Despite the initial concerns about loudness, it proved to be quiet and drone-free at cruising speeds between 60-80 mph, making long highway drives more enjoyable. Surprisingly, the exhaust was quieter from the outside, allowing drivers to enjoy the enhanced sound without disturbing their neighbors.
In terms of design, the trapezoidal tips of the muffler were sharp and unique, featuring crisp STI logos. While the muffler offered a mixed experience, with occasional noise issues inside the cabin, it still managed to be tolerable in important ways. However, it is important to note that Subaru does not claim any horsepower gains from the muffler, as it only includes the resonator and tips without any changes to engine tuning. With a price tag of $1,139.95, it is a significant investment that should be carefully considered based on individual preferences.
Ultimately, the decision to purchase the STI muffler should be weighed against the pros and cons outlined in the review, as well as personal priorities. Listening to the video sample provided by Subaru can also help in making an informed choice. While the muffler may not be suitable for everyone, it offers a unique combination of performance and design features that may appeal to some drivers.