AMS Performance Reverse Rotation Intake Manifold - Un-Coated - 2002-2014 Subaru WRX / 2004-2021 Subaru STI

Features:

• Reversed, Un-Coated Version
• 4.5 Liter Plenum Volume
• 13” Equal Length Intake Runners (Measured from Face of Bellhorn to End of Runner)
• 2.5” (63.5mm) Intake Runner Diameter (ID of Bellhorn)
• Bellhorn OD 3.8” (96.7mm)
• Increased Port Size at Cylinder Heads Allow Matching to Larger Hand Ported or CNC Ported Cylinder Heads
• Available in Standard or Reversed Configuration
• Throttle Body Opening Accepts Larger Throttle Bodies up to 2.625” (66.675mm) or 70mm with mild porting
  

The AMS Performance Reverse Rotation Intake Manifold for 2002-2014 Subaru WRX / 2004-2021 Subaru STI was meticulously designed to surpass all competitors in performance. Drawing inspiration from cutting-edge design practices and conducting thorough engineering analyses, our team has crafted the ultimate intake manifold for the Subaru EJ20 and EJ25 engines. Through rigorous testing, we have produced a manifold that outmatches all other options currently on the market in terms of power output.

Product Notes

• See application information below
• Due to the large variety of rotated turbo kits on the market, we cannot guarantee fitment with every brand. Depending on the turbo location and sizing, interference with the cylinder 3 intake runner is possible.
• Some port matching may be required when used in conjunction with CNC or hand ported cylinder heads.
• The intake manifold is available with a standard or optional reverse throttle body orientation, allowing for more direct intercooler pipe routing.
• 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, but cable throttle bodies can be used with custom fitting and flange adapter.
• Standard configuration intercooler piping will need mild custom fabrication due to placement of throttle body.
• Reversed configuration requires the relocation of the alternator and removal of the A/C compressor. Installation is not a direct bolt on and will require custom intercooler piping.
• The intake manifold is designed to use a common Subaru aftermarket top feed injector size. (48mm overall length / 11mm inlet – standard Subaru rail size / 14mm outlet) We recommend the use of Injector Dynamics brand injectors.
• Standard Subaru style injectors cannot be used. (Side Feeds, Stock STI Style Injectors)
• Not compatible with side feed to top feed conversion rails
• Requires aftermarket rails and lines, will not fit with stock
• Not compatible with top mount intercoolers.
• Not directly compatible with mounting the factory upper coolant reservoir. Custom bracketry will need to be fabricated to mount.
• The bottom of the center plenum features four 1/8″ and one 1/4″ NPT ports for vacuum accessories.
• 2008+ STI may require mild clearancing of A/C compressor line