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GrimmSpeed Chase Overtake Turbo Upgrade Kits for 4th Gen Subaru WRX STI

Subaru WRX STI - 2015 to 2021 - Sedan [All] (Overtake BB500)
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Fits:
Subaru WRX STI - 2015 to 2021 - Sedan [All Trim Levels]
More Info:
Direct bolt-on installation. No modifications required.
List Price:
$1699.00
Our Price:
$1699.00
You Save:
$0.00
 
 
1-4 DAY FAST FREE SHIPPING!
(free to mainland U.S. only)
Select an Application For Your
4th Gen Subaru WRX STI
 
Year Range
Door Config  [Trim Level]
Application / Notes
2015 to 2021
Sedan [All]
(Chase JB400)
2015 to 2021
Sedan [All]
(Overtake BB500)
 
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CARB Compliance / Exemption Warning: If you live in California and your application for this product is not CARB Compliant / Exempt, then you cannot purchase it for public highway or street use (in that case it could only be used for formally sanctioned race use on a racing vehicle that may never be used on a public highway or street). If your application is not CARB Compliant / Exempt and you're shipping to California, our system will let you know on the final checkout page.

This manufacturer has a policy which prevents shipment to California for applications of this product that are not CARB Compliant / Exempt. Therefore, if you live in California, you will not be able to receive your part if it does not have a CARB EO #, even if it is for a dedicated race vehicle.

These turbos are designed to fit directly on the stock turbo flange. A tune and fuel upgrades are required to properly utilize the increased power levels these turbos offer.

As you slowly build your engine for more power, you find that the stock turbo begins to struggle to keep up. The stock turbo can only handle so much pressure and airflow before it can no longer deliver what is necessary. GrimmSpeed spent 3 years developing these "Chase" JB400 and "Overtake" BB500 turbo upgrades to solve this problem, and the results are amazing.

  • The Chase JB400 is the smaller option, but delivers incredible punch. Let's just say it's not your average journal bearing turbo. The compressor wheel size (Inducer / Exducer) is: 51.2mm / 73.8mm Extended tip, 48 Trim, and the turbine wheel size (Inducer / Exducer) is: 53.8mm / 47mm, 76 Trim. Compressor A/R is 0.65 and Turbine A/R is 0.88. The compressor wheel is made of billet 2618 aluminum, and the compressor housing is made of A356 aluminum. The Chase JB400 turbo also uses severe-duty 360 degree thrust and twin hydrodynamic bearings for extreme reliability for it's size. It's got quick response and excellent spool too. The wastegate is also adjustable and preset to 15 PSI.
  • The Overtake BB500 is the larger one of the two turbos and brings it's best to the table. In short, it's a world-class ball bearing turbo that still has great response and spool characteristics. The compressor wheel size (Inducer / Exducer) is: 55.1mm / 74.6mm, 54 Trim, and the turbine wheel size (Inducer / Exducer) is: 60mm / 55.1mm, 84 Trim. Compressor A/R is 0.65 and Turbine A/R is 0.88. Made from the same materials as the JB400 but much larger in size. This option also uses upgraded ceramic ball bearing featuring silver plated 4340 steel bearing cages for exceptional strength and durability at very high speeds and heat. The wastegate is also adjustable and preset to 15 PSI.
Key Features:
  • Capable of 440+ whp on the Chase JB400 Turbo and 488+ whp on the Overtake BB500 Turbo while still maintaining great throttle response and mid-range power / torque. These results can be achieved with just basic bolt-ons, fuel mods, and a tune. More hardcore upgrades like cams and an intake manifold will yield even more power.
  • Made from top-tier materials for extreme durability and performance.
  • Fits on the stock turbo flange.
  • Incredible flow and operation.
  • Adjustable wastegate.
  • 3 years of development time to achieve perfection!

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Verified Reviews

See a few of our reviews below:
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Amazing customer service and fast shipping, delivery! Im surprise as most aftermarket companies would take at least a week. Plus, if you got questions then they got answers. Also, thank you for the discount code as it helped me out BIG time on my purchase. Waiting for the perfect day when I can install the D2 racing coilovers. Thank you guys so much.
Merchant Reply ArrowReply from company
Peralta, Thank you for your kind words! We're thrilled to hear you had such a positive experience with our customer service and fast shipping, especially with your order of D2 racing coilovers. We strive to provide the best service and are glad the discount code helped with your purchase. If you have any questions or need assistance before your install, feel free to reach out. Were here to help! Best Regards, Customer Care
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Love the prices, service, speed of delivery and their attention to customers. I will continue purchasing from them for all my vehicle needs.
Merchant Reply ArrowReply from company
Samit, Thank you for your kind words! We're thrilled to hear that you appreciate our prices, service, and delivery speed. It's our goal to provide the best possible experience for your vehicle needs, and we're glad to have you as a valued customer. We look forward to serving you again in the future! Best Regards, Customer Care
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Fast shipping, and I got it cheaper than literally other site in the first 5 pages of Google had it listed! Customer support actually answered and was a real person! It was my first time ordering from them (though I've heard the name since I was a teenager) so I was a bit hesitant, but I'll definitely be coming back for my next few parts!
Merchant Reply ArrowReply from company
Ryker, Thank you for your kind words! We're thrilled to hear that you found our shipping fast and our prices competitive, especially for your car parts. It's great to know our customer support was able to help you as well. We strive to provide the best experience for our customers, and we're excited that you're planning to return for future orders! If you have any questions in the meantime, feel free to reach out. Best Regards, Customer Care
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Customer service was professional and polite. The shipping was fast and the part is a direct fit as the description described. Overall great experience and will be ordering more parts in the future through Pro Import Tuners
Merchant Reply ArrowReply from company
Junior, Thank you for your fantastic review! We're thrilled to hear that you had a great experience with our customer service and found the part to be a direct fit for your vehicle. We strive to provide top-notch service and quality products for our customers. We look forward to assisting you with your future orders! Best Regards, Customer Care
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Just what I needed and asked for , lowest price around for this product too ! , keep it up and you'll have a forever loyal returning customer here
Merchant Reply ArrowReply from company
Daniel, Thank you so much for your positive review! We're thrilled to hear that you found exactly what you needed at a great price. We aim to provide the best place for customers to upgrade their vehicles, and your loyalty means a lot to us. If you have any questions or need assistance in the future, feel free to reach out! Best Regards, Customer Care