AMS PERFORMANCE SUBARU WRX / STI EJ INTAKE MANIFOLD

Stay Ahead Of Your Competition With The AMS Subaru WRX / STI Intake Manifold! 

The AMS Subaru Intake Manifold sets a new standard in performance. Drawing inspiration from modern design principles and engineering studies, we've crafted the ultimate intake manifold for Subaru EJ20 and EJ25 WRX & STI models. Extensive testing has resulted in a manifold that surpasses all others on the market, delivering unmatched power gains.

Benefits 

• 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 
• Available in 4 Configurations (Standard, Standard Coated, Reversed, and Reversed Coated 

Product Notes 

• 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

Employing Solidworks© & CFD (computational fluid dynamics) software, we began with a 4.5L plenum for unparalleled top-end power. Our design includes CNC machined bellhorns, acting as internal velocity stacks, ensuring a broad power curve and high RPM capabilities. Optimized 2.5" tapered runners and matched cylinder port angles minimize turbulence and maximize power output. With 13" length runners, the AMS Subaru EJ Intake Manifold offers exceptional flow with smooth cross-section reduction.

Unmatched power gains and excellent response 

This AMS Subaru EJ Intake Manifold delivers more than just top-end power. Experience an exceptionally wide power-band with a significant boost whenever you hit the throttle, resulting in improved lap times on the road course and dominance on the drag strip. Don't settle for second place—order your AMS Subaru EJ WRX / STI Intake Manifold now and be the one to beat.

Applications 

• 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 (2008+ STI may require mild clearancing of A/C compressor line) 
• Will fit various Legacy and Forester EJ25 applications with proper throttle body usage and custom fitting