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Description
AMS PERFORMANCE SUBARU WRX / STI EJ INTAKE MANIFOLDStay Ahead Of Your Competition With The AMS Subaru WRX STI Intake Manifold! 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! Benefits 4. 5 Liter
Stay Ahead Of Your Competition With The AMS Subaru WRX / STI Intake Manifold!
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!
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
Engineered To Be The Best
For the Subaru EJ Intake Manifold the plan was simple, take our years of engineering experience and design the best intake manifold available. Designed, prototyped, and tested in house by our team of Engineers, the AMS Subaru EJ Intake Manifold was created to be the best unit available on the market. By casting this manifold it is not only stronger, but it allowed us to optimize the power output by giving us the freedom to sculpt the interior geometry for maximum efficiency and airflow.
By utilizing Solidworks© & CFD (computational fluid dynamics) software we started with an extremely large plenum size of 4.5L for the ultimate top-end power. We also designed CNC machined bellhorns which act as internal velocity stacks and allow for a broad power curve and high RPM horsepower capabilities. This allowed us to optimize massive 2.5″ tapered runners and matched cylinder port angles to minimize turbulence and maximize power output. The 13″ length of the runners allow for a smooth taper in cross section reduction, giving the AMS Subaru EJ Intake Manifold exceptional flow.
Unmatched power gains and excellent response
This AMS Subaru EJ Intake Manifold offers more than just top end power. This manifold gives you an amazingly wide power-band with a huge jump in power whenever you are in boost. This equates to greatly improved lap times on the road course and the confidence to leave any opponent in your dust when on the drag strip!
Be the guy to beat, order your AMS Subaru EJ WRX / STI Intake Manifold now!
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
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.9 ★★★★★
Based on 27 reviews
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Product Reviews
★★★★★ 5
Wonderful!
Size: Standard/Queen (Pack of 1), Style: High Loft (6"-7")
I ordered the loftier version of the pillow and I love it! I'm a side sleeper and I've been having pillow issues over the last few years where I swear every pillow is either too tall, too thin, too soft to provide support, to firm and hurts my ears, or the stuffing is too slick or something and migrates away from wherever I put my head. It's been... A time.
But this pillow has been wonderful! I've been using it for a couple weeks now and it's the perfect height for me! The latex inner chamber provides some much needed support, but the softer outer chamber gives me enough cushion to keep my ears from aching.
I will say that, while this is the perfect height for me, personally, I think that if you're someone who prefers a pretty lofty pillow, that this might not be tall enough for you. I ordered the taller version, and it feels right for me, but I've noticed in my pillow buying extravaganza that even pillows that everyone else loves that are designed for side sleepers are usually just too tall for me. So if this pillow is right for me, and you prefer a pretty lofty pillow, I really bet that this won't be tall enough in that case. It's definitely more of a medium loft, rather than a very high loft
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Reviewed in the United States on June 20, 2024
★★★★★ 5
Read this review. This pillow saved me.
Size: Standard/Queen (Pack of 1), Style: High Loft (6"-7")
I have to testify about this pillow, my brothers and sisters. Ever since I hit my 30s, my body has gone down. Aches and pains. Pops. Crackles. Snaps. It’s ridiculous. Over the last 2 years, I have managed to injure a muscle in my shoulder and the pain is unbearable when it is inflamed. I finally narrowed it down to the pillow I was sleeping on. I have an attachment to a pillow I’ve owned for over 20 years - that’s another story. I could fold it 3 times and it was finally thick enough to support my head. My shoulder got so tore up recently that I had to go through 2 rounds of steroids plus round the clock ibuprofen. Waking up in the night, the whole ordeal. I ordered this pillow after much research all over the internet. I was appalled by the $165 price ticket. But when you’re in that level of pain, you’re just about willing to do whatever it takes. The first night I immediately noticed I got more consecutive hours of sleep than I had in weeks. A week later and my shoulder is pain free. I could’ve cried. The height of this pillow stabilizes my neck and shoulders perfectly. It is firm, but gives and contours to your neck and head. It’s a heavy pillow but I don’t even care. Truly I don’t think I’ll ever go back. This pillow has saved my shoulder and I’ll never stop thanking God for it. If you’re experiencing back, shoulder, or neck pain and are considering this pillow, just order it. Please. Just do it. I’m forever changed. But I’m still keeping 20 year old pillow… just for sentimental purposes. 😂
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Reviewed in the United States on September 3, 2025
★★★★★ 5
Side sleeping pillow
Style: Standard - Medium
Great pillow for specific people. If you want a firm yet soft pillow for side sleeping then it works great. Not as good for back sleepers but it's very comforting and cooling.
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Reviewed in the United States on May 17, 2026
★★★★★ 5
Great therapeutic pillow
Style: King - Low
I have been having pinch nerve issues where my fingers fall asleep with the pillow I had, so I started to search for pillows that would alleviate that and stay within a budget. Although this pillow cost more than I wanted to spend, the only other pillow that I was considering cost $100 more than this Purple pillow, so I purchased this pillow. The neck pains and pinch nerve issues are mostly gone. It is comfortable, maintains its shape and keeps you cool. I hope this pillow lasts a few years.
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Reviewed in the United States on March 24, 2026
★★★★★ 5
This Pillow Is The Greatest!
Style: Standard - Tall
This pillow is amazing! It’s very pricey, but worth EVERY penny in both my opinion and my husband’s. My husband had been complaining about his old pillow for a while. I did some research and this pillow seemed to be the best of the best according to the reviews. But that price - yikes! I kept checking back and saw it was on sale and decided to take a chance. Bought it in the tall size (7.5 in.) and decided it would be his early birthday gift. The first night of him using it was AMAZING for both of us. He has snored like a freight train and will periodically stop breathing for 15-18 seconds throughout the night for the past 26 years that I know of. Immediately, his super loud snoring downgraded to a very low level of snoring. He said after the first night he fell asleep fast, did not wake up nearly as much and finally had no neck pain in the morning. He’s had it over a month now and says he can’t believe a pillow could make this big of a difference in his sleep quality. I can’t believe I don’t have to deal with his concert level snoring anymore. Plus, he no longer stops breathing for short intervals anymore! This pillow has been well worth the cost for us!
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Reviewed in the United States on April 2, 2026