Here, you are looking at the Tomei Unequal Length Exhaust Manifold for the 2015-2021 WRX.
Let's get a few things straight! You've come here for a reason, you have questions, and we have answers.
While this header will not help you break any records, This exhaust manifold is the result of 4 years of research and development to provide you with a quality manifold that will create that unique boxer sound while improving the power and performance of your vehicle. If you're looking to unlock that ever-so-infamous boxer rumble out of your FA20DIT WRX, this is the way. The couple HP and Ft/lbs you're leaving on the table will be negligible compared to the smile this will put on your face every time you hit the gas.
What is special about this particular header is that it is the world's first and only one-of-a-kind unequal-length exhaust manifold type for the FA20DIT platform.
While the commonplace mindset is that an equal-length header will most efficiently make power, Tomei understands that despite the efficiencies of an equal-length setup, the sound is a large factor for a lot of consumers! You may have noticed your WRX does not sound like most other Subarus on the road, and you lack that rumble we've all come to know and love. Well, Tomei has the perfect solution for you!
Tried, Tested, and Tuned.
When this header first hit the market, we decided to put it to the test on our 2019 WRX shop car. In our testing, this header served as a perfect middle ground between sound and performance.
This header did make power more efficiently than the OEM equal-length manifold but will leave some power/spool time on the table in comparison to an EL header. We noticed about a 500 RPM increase in initial spool time, but did see gains in both the mid-range and top-end portions of the power band.
With that said, this header is still a great option for those of you who are not chasing numbers and are looking to add some throatiness to your exhaust note. This header provides an AWESOME exhaust note and is bound to give the WRX that rumble you know and love. After all, it's what makes a Subaru a Subaru.
DETAILS:
- SUS 304 stainless steel construction
- 2mm piping thickness
- World's first unequal-length design for the FA20DIT platform
- Creates the boxer exhaust note
- The design removes all the multiple narrow restrictions found in the OEM manifold
- Larger turbo side port ID on the flange compared to stock
- Saves weight
- Improves both horsepower and torque
- Reduced turbo spool time and improved throttle response
- Includes new gaskets and header wrap
