Tomei Unequal Exhaust Manifold Headers

The release of the FA20 WRX resulted in huge disappointment to long term Subaru fans who fell in love with the boxer rumble. Fortuantely, Tomei have brought it back! Not only will you hear and feel the classic EJ boxer note, you will experience a significant increase in performance.

Every flaw of the OEM header has been addressed and improvised during the development of the Tomei header, resulting in power gains you can feel throughout the powerband of the car. The OEM headers restrict air flow resulting in loss of power and efficiency. Tomei headers have incresed the exhaust piping from 33mm to a masssive 42mm  resulting in an increase in power and efficiency.

The collector on the Tomei headers were made using the lost wax method. The lost wax method allows the collector pipes to merge smoothly, therefore eliminating any restrictions on the header. The slide adjuster on the Tomei header allows users running thicker headgaskets to appropriately extend the header to accomadate for the thicker headgasket. The flange on the Tomei headers is highly rigid, lightweight, and has a stepless flange. 

• 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

• 1 x Unequal Exhaust Manifold
• 2 x Exhaust Cylinder Head Port Gaskets
• 1 x Manifold to Turbo Gasket
• 1 x Turbine Outlet Gasket
• 1 x Compressor Inlet Gasket
• 1 x Exhaust Wrap Roll
• 8 x Exhaust Wrap Ties
• 1 x Bracket and Hardware Set