AMS Performance EJ25 Intake Manifold Red Subaru 2002-2014 WRX / 2004-2021 STI

The AMS Performance EJ25 Intake Manifold has been designed for those looking for the right intake manifold to accommodate big horsepower setups. AMS utilized computational fluid dynamics software and the result is a larger plenum size of 4.5L for more top-end power, along with CNC machined bellhorns which act as internal velocity stacks which will allow for a broader power curve and high RPM horsepower capabilities.  FEATURES: 4.5-liter plenum volume 13" Equal length intake runners measured from the face of bellhorn to end of the runner 2.5" (63.5mm) intake runner diameter Bellhorn OD 3.8" (96.7mm) TGV housing replaced with long runner design Increased port size at cylinder heads allow matching to larger hand ported or CNC ported cylinder heads Throttle body opening accepts larger throttle bodies up to 2.625" (66,675mm) or 70mm with mild porting This version intake manifold is available with a standard orientation Bottom of the center plenum features 4-1/8" and 1-1/4" NPT spots for va