This 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 vacuum accessories
• Uncoated, textured ted, gold, bronze, black, and blue colors available

FITMENT NOTES:

• NOT BOLT ON, PLEASE READ ALL NOTES BELOW FOR NECESSARY MODIFICATIONS
• Some port matching of the manifold may be required when used in conjunction with CNC or hand ported cylinder heads
• Larger throttle bodies can be used with proper modifications (up to 70mm with minor porting, larger throttle bodies may also require adapter flanges)
• The intake manifold is flanged for 04+ STI drive by wire throttle bodies, other models (such as 08-14 WRX) require a change to the STI style throttle body
• Cable throttle bodies (such as 02-05 WRX) can be used with custom fitting and flange adapter
• Standard configuration intercooler piping will need mild custom fabrication due to placement of throttle body
• Designed to use common Subaru AFTERMARKET top feed injector size (48mm overall length / 11mm inlet-standard Subaru rail size / 14mm outlet)
• Not compatible with OEM subaru injectors
• Not compatible with stock fuel rails or lines, requires aftermarket top feed rails and lines
• Not compatible with top mount intercoolers
• Not compatible with hard pipe stock location turbo inlets, requires silicone inlet
• Not directly compatible with mounting the factory upper coolant reservoir