Tomei Expreme Unequal / Equal Length Exhaust Manifold Kit - Subaru WRX 2015 - 2020
The turbo side of the OEM headers severely restricts the flow of the exhaust gas, resulting in loss of 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 OEM headers have multiple restriction points which results in poor exhaust flow.
Tomei headers have an even 45mm piping from the engine all the way to the turbo, therefore allowing the exhaust gas to flow smoothly.
The OEM headers turboside port is severely restricted by its 33mm port on the header.
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