Part #: PRW-PWIM001B. The Process West billet intake manifolds are a masterpiece. Combining great looks with top - notch performance, they're the result of years of research and multiple prototypes. Available in two setups, they feature a full billet plenum, large billet bell mouths, and thick - wall polished CNC mandrel bent tubes. TIG welding makes them strong enough for up to 100psi boosted applications. This is the best induction system for Subaru WRX/STI. The plenum volume and runner length are optimized for high low - and mid - range torque and increased top - end power. Many customers swap out other aftermarket manifolds for this one because of its unmatched performance. Even on a stock setup, you can expect over 10% gains. They recommend the Track version for non - AC performance setups, from normal to extreme track and drag cars.
Using this intake manifold is straightforward. First, make sure your Subaru STI is turned off and cooled down. Remove the old intake manifold carefully following your car's service manual. Then, install this Process West intake manifold in its place, ensuring all connections are tight. When it comes to maintenance, regularly check the connections for any signs of looseness or leaks. If you notice any issues, tighten the bolts or replace the gaskets as needed. Keep the manifold clean by using a mild cleaner and a soft cloth. Also, since it's designed for high - performance, if you're using it in a high - boost situation, make sure your engine's cooling and fuel systems can handle the extra load.
