Tomei Unequal Length Exhaust Manifold Subaru WRX FA20DIT 2015-2020 TB6010-SB04A

Tomei Unequal Length Exhaust Manifold Subaru WRX FA20DIT 2015-2020 TB6010-SB04A

1. Tomei Unequal Length Exhaust Manifold is different from OEM in few ways.

2. The Tomei Headers do not restrict air flow after engine port like the turbo side from OEM.

3. The restriction of the air flow will retard the process and lead to loss of power and efficiency.

4. The collector for the Tomei Headers are made from lost wax method. 

5. The lost wax method will allow for smooth merging of the collector pipes. This will eliminate restriction on the header and improve the performance.

6. The OEM headers had anomaly with few restriction points that will hamper the exhaust flow.

7. The 45 mm piping all the way from engine to turbo will ensure smooth flow without disturb and will improve the horsepower.

Tomei Unequal Length Exhaust Manifold Subaru WRX FA20DIT 2015-2020 TB6010-SB04A