SKU: 55905964644

JB4 Tuner for Subaru WRX, Ascent, Legacy, & Outback

$243.00 $270.00
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  • USA
  • CAN

Ships within 48 hours · Estimated delivery Sep 29 - Oct 4

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Description

JB4 Tuner for Subaru WRX, Ascent, Legacy, & OutbackPower gains of up to 50hp to the wheels on a stock vehicle The JB4 is the most advanced and highly featured tuning system for your Subaru 2. 4L 4 cylinder turbo. Power gains are up to 50hp to the wheels (70hp crank) on a completely stock car on pump gas, and gains with ethanol mixtures and bolt on parts are even higher. The JB4 features a simple plug & play installation harness for easy installation & removal and includes many features not found with

Power gains of up to 50hp to the wheels on a stock vehicle

The JB4 is the most advanced and highly featured tuning system for your Subaru 2.4L 4 cylinder turbo. Power gains are up to 50hp to the wheels (70hp crank) on a completely stock car on pump gas, and gains with ethanol mixtures and bolt-on parts are even higher.

The JB4 features a simple plug & play installation harness for easy installation & removal and includes many features not found with any other tune. Including on the fly map switching from your phone/tablet instead between factory and various performance maps, boost limiting by gear for improved traction in lower gears, progressive water/methanol support, built-in data logging, built-in code reading, and much more.

Wirelessly Connect to your JB4: Grab our all-new JB4 PRO smartphone connection to wirelessly connect the JB4 BMW tuner to your Bluetooth 4.0 compatible iOS or Android device. This option allows you to record and analyze vehicle and tuning data, change JB4 performance maps, and update JB4 firmware as we release free newer versions with updates, more powerful maps, and new features under development. Our new adapter fits fully inside the JB4 enclosure for enhanced weather protection and a more streamlined look. The JB4PRO Free app features an intuitive easy-to-use interface, help buttons, and advanced log analysis tools that can estimate the performance of your car and help identify any tuning concerns. For more info on how to use the JB4PRO free app click here.

Subaru JB4 Features & Benefits

• Power gains of up to 50hp to the wheels on a stock vehicle
• Improves 0-60 times and 1/4 mile times
• Preloaded with custom JB4 Subaru tuning software and up to 8 maps for various fuel and modification levels
• Ethanol (E85) compatible tuning maps
• Able to read/delete fault codes
• View and record up to 30 different gauges/engine parameters in real-time with the JB4PRO app.
• Boost by gear in 1st, 2nd, and 3rd can be controlled via the JB4PRO app for a perfect launch
• Compatible with the FREE JB4PRO app for smartphone logging, tuning changes, and adjustment
• The JB4 offers a lot more performance, functionality, and safety than your average performance chip
• Quick Plug & Play Installation
• CANbus OBDII integration offering unrivaled tuning features and performance
• Improved performance over non-integrated chip tunes
• Runs as smoothly as stock, this is how your vehicle should have come from the factory
• Compatible with all driving modes
• Fuel economy unchanged during normal driving
• 91 octane fuel or better required for performance gains
• Not VIN locked and can be removed without a trace and resold down the road
• Includes the rugged JB4 billet aluminum enclosure for protection
• Designed and assembled in USA
• 5 year warranty

Vehicle Fitment

• 2022+ Subaru WRX 2.4L 4 cyl. Turbo
• 2019+ Subaru Ascent 2.4L 4 cyl. Turbo
• 2020+ Subaru Legacy XT 2.4L 4 cyl. Turbo
• 2020+ Subaru Outback XT 2.4L 4 cyl. Turbo

What is a JB4?

The JB4 is a plug & play tune available for turbocharged vehicles. The JB4 tuner installs between your car's sensors and the DME/ECU (computer) and manipulates vehicle performance through these connections making your vehicle much faster. While it's not the only tuning system that operates this way the JB4 separates itself from the competition with much more advanced connection points and processing including CANbus, fuel & spark control, Bluetooth to your smartphone, and a variety of innovative and advanced features not possible with any other system. BMS regularly publishes free mapping and firmware updates adding performance and features as ongoing development allows. In addition, the JB4 system is not VIN-locked to your vehicle and can quickly be removed and swapped between cars or resold at a later time. Often imitated but never duplicated the JB4 has been the gold standard in plug and play turbocharged performance tuning for over a decade and is sold in over 67 countries worldwide.

Is the JB4 a real tune?

Yes the JB4 is a real tune. By tapping into specific sensors and CANbus for real time vehicle data the JB4 is able to alter your boost, timing, AFR, and/or fuel trims, to a similar degree an ECU reflash would, but without the vehicle ever knowing its been tuned. The result is safe, smooth, and significant power and torque gains while retaining your factory safety systems and without having to unlock/flag your ECU.




WRX DYNO RESULTS

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. 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
SKU: 55905964644

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4.5 ★★★★★
Based on 28 reviews
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Verified Purchase
Bonnie Brae
Boise, US
★★★★★ 5
BEST ROBOVAC EVER!
Size: 11S MAX
This is BEST Robovac you'll ever own, IMHO. I purchased the first robovac made by a different company when these little things were a completely new concept. This is BEST Robovac you'll ever own, IMHO. I purchased the first robovac made by a different company when these little things were a completely new concept. It was such a surprise as to how good it was, and how it made a difference in time spent housekeeping every day. I've been a fan ever since (20+ yrs) and have tried many different brands and models. The Eufy is the best! And I have purchased 3 of this model. Depending upon your budget and specific needs, there are things I've learned, and I'm going to break those points down for your consideration. Possibly they may apply to your situation. These points are some requirements that make all the difference to me and my lifestyle. ~~> #1. Two auxiliary brushes.: This is the most important thing for me and is a no brainer, IMHO. The two brushes, one on each side of the front edge (approx 11 and 2 o'clock) sweep the debris to the underneath center of the unit where it is sucked up. Because there are two, they sweep a larger area, and because the vac covers the same areas more than once, you get better cleaning results. This is very important in kitchens and high traffic areas. Also corners are swept from both sides. #2. Undercarriage rotating beater brush: I have both carpeted and uncarpeted areas. I need more than just suction to lift dust, pet hair, dirt, and debris from my floors. My kitchen does not have carpet so an undercarriage beater brush is not a requirement, but my Family room has carpeting, and my Living room has Oriental wool and silk rugs. They need a light agitation to help lift up the dust so the vacuum can easily suction it up. A beater brush is a major requirement for my floors for this reason. #3 Scheduling option: this is WONDERFUL! Our major living areas are scheduled to vacuum after we've gone to bed, and our bedrooms and bathrooms are scheduled while we are gone during the day. Happy feet! #4. Rechargeable on its own! Need I say more? It goes back to the recharging station to recharge itself when it needs more juice. YAY! We live on three floors, and this is a huge plus for us. #5. The Customer service with this company is amazing! If you have any issues, regardless of how small, they will get back to you, and immediately help. They respond, and do not merely send you to a FAQ link. #6. It is gentle and does not smack into your furniture, scuffing it. #7. The more you use it, the cleaner your house will be. Regular dusting is done on a daily basis so there is less and less dirt and dust to deal with. It is amazing the difference! Weekend freedom! #8. You do not have to do much prep at all, just check for loose cords to not become tangled. When I bought my first robovac I didn't use it too often because I was unnecessarily moving furniture, rugs, floor lamps, trash cans, etc. Then one day, I left a door open and the robovac sneaked out of the room I'd religated it to. When I returned home, the little vac had done my whole house (single level @ 2000 sq feet) and it was GREAT. I realized that all I needed to do from then on was to let it go do its thing. Lesson learned. My Eufys are my workhorses and I recommend this little gem of a vac if you are considering it. IMHO It will be a good investment. It has been for me, and my family (including cats and dogs).
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 13, 2025
K
Verified Purchase
Katrin aus Wien
Houston, US
★★★★★ 4
Absolute worth the money
Size: 11S MAX
The RoboVac works well for me. Very easy to use, not noisy, easy to empty dust collector out, picks up dust and crumbs etc. better than expected. It works on its own from room to room and transitions just fine from hard to soft surfaces. It even manages my higher pile carpet in some rooms. It‘s not heavy, so I use it upstairs and downstairs, just carry it up or down, plug in and start it. Easy! It works best if you get all cords and anything that it could caught up in out of its way beforehand. Sometimes it gets itself ‚ worked up’ and goes over one area several times which is weird. My house ist quite big and if it works over one area over and over, it does not have enough battery life to do the entire ~16000 sqft. floor on one level with different rooms and changing surfaces (I expected this, no prob. for me). The vacuum results are not as good as using a Miele canister vacuum ( my other vacuum) but good enough so the Miele only has to be pulled out from time to time for a deep vacuuming. I would buy it again.
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Reviewed in the United States on May 15, 2021
N
Verified Purchase
NorEast
Massapequa, US
★★★★★ 5
Good Value
Size: 11S MAX
Works as advertised. Quiet and efficient. The price was competitive.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 18, 2026
L
Verified Purchase
L
Belleville, US
★★★★★ 1
Customer service –4 stars. Vacuum, 5 stars
Size: 11S MAX, Size: 11S MAX
I received the wrong remote control for this product. It doesn't work with the vacuum at all. I called Eufy customer support twice. The 1st time, after I told them the issue with the remote, they would put me on a 3 minute hold, come back and ask me the same question. This happened 3 times. They then asked me for my email address so I could send them the picture of the remote. They told me to stay on hold but the call disconnected and I never received the email to send them the pictures. The 2nd time I called them I told them the same issue with the remote, they put me on a 25 minute hold and they never came back. I instead received an automated survey message to let them know how they did. They did poorly. Massive waste of time. I didn't want to return the whole vacuum just because of the remote. It's refurbished and the vacuum itself works very well! All I need is the correct remote.
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Reviewed in the United States on May 4, 2026
D
Verified Purchase
Darren see
Port Orchard, US
★★★★★ 5
My favorite robot vacuum! Works awesome!!
Size: 11S MAX, Size: 11S MAX
Eufy is by far my favorite robot vacuum brand we had one for several years and it did amazing with everything from dust to hair and even rocks didn’t phase it! It is super easy to set up, turn on, the settings are very user friendly and emptying the dust bin is super simple! They are very powerful but also compact and can fit in smaller places so that’s great for us and even when I don’t think there’s much on the floor it always gets full! You honestly can’t beat the price for how great these awesome little vacuums work definitely get your value for your money! I was a little skeptical getting the refurbished or Like-New one but I am super impressed so far! So grateful for tools like this to have around that are great at lending a hand 🤩
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 12, 2026

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