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

Stay Ahead Of Your Competition With The AMS Subaru EJ Intake Manifold

The AMS Performance EJ25 Intake Manifold was carefully crafted to exceed all competitors. Drawing inspiration from contemporary designs and thorough engineering research, our team has produced the ultimate intake manifold for the Subaru EJ20 and EJ25 WRX & STI. Extensive testing has shown this manifold to outperform all other options currently on the market, making it the top choice for maximum power.

 

Engineered To Be the Best

The AMS Performance EJ25 Intake Manifold is the result of our extensive engineering expertise and rigorous testing in-house. Our team of engineers designed and prototyped this manifold to be the top choice on the market. By utilizing casting techniques, we have crafted a stronger and more efficient manifold, allowing for maximum airflow and power output.

 

Using Solidworks© and CFD (computational fluid dynamics), we began with a 4.5L plenum size to achieve maximum top-end power. Additionally, we incorporated CNC machined bellhorns as internal velocity stacks to enhance power throughout the RPM range. The design includes optimized 2.5" tapered runners and matched cylinder port angles to reduce turbulence and maximize output. To accomplish this, the TGV section of the manifold was essential, allowing for a gradual taper over the entire 13" length of the runners, rather than just a few inches within the factory-style TGV housing.

 

By incorporating TGV housings into our manifold, AMS has created a cost-effective, one-piece solution for the Subaru EJ engine. No longer do you need to buy a separate intake manifold and TGV delete housings.

 

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Product Notes:

• 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.

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
• Will fit various Legacy and Forester EJ25 applications with proper throttle body usage and custom fitting