Here it is! Introducing the AMS Performance Subaru EJ WRX/STI Intake Manifold. The manifold was designed with performance and big HP custom setups in mind. With the level of builds this manifold will be used in, there will be some customizing required. Get yours today!
The AMS Subaru Intake Manifold was designed to outperform the competition. We referenced many modern design examples and engineering studies to bring you the best intake manifold available for the Subaru EJ20 and EJ25 WRX & STI. After extensive testing we ended up with a manifold that makes more power than anything else currently available on the market!
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)
TGV Housing Replaced with Long Runner Design
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
Available in 4 Configurations (Standard, Standard Coated, Reversed, and Reversed Coated)
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 stock fuel rails or lines.
Not compatible with top mount intercoolers.
Not compatible with hard pipe stock location turbo inlets, requires silicone inlets.
Not directly compatible with mounting the factory upper coolant reservoir.
The Bottom of the Center Plenum Features 4 – 1/8″ and 1-1/4″ NPT Spots for Accessories.
02-05 Subaru WRX w/ EJ20 (Requires adapter to use WRX style drive by cable throttle body)
06-07 Subaru WRX w/ EJ25
08-14 Subaru WRX w/ EJ25 (Requires using STI style drive by wire throttle body)
04-Current Subaru STI w/ EJ25
Will fit various Legacy and Forester EJ25 applications with proper throttle body usage and custom fitting
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