Tomei Expreme Unequal Length Exhaust Manifold - Subaru STI VA Walbro - Heavy-duty street & racing

- Heavy-duty street & racing system

- Engine mount set with Transmission mount

Cap Finish Anodize Black

Serial program cable

Tomei Expreme Unequal Length Exhaust Manifold - Subaru STI VA Walbro - Heavy-duty street & racingTomei introduced the high efficiency 4 1 as against the STD 4 2 1. The exhaust efficency of the standard exhaust manifold is not perfect. But Tomei 4 1 type exhaust manifold has high efficency. You could see the change of dramatically driving feeling. The complete equal length is good for the exhaust intervention but reduce the turbine performance and increase the exhaust resistance. Contrary to that, the not equal length exhaust manifold can lead the