BNR ST71 V2: A Proven 500 WHP Turbo Upgrade for the Focus ST

If you've been around the Focus ST platform for a while, you probably remember when BNR first introduced their upgraded turbochargers. Back then, they were commonly known as the BNR 2867 and BNR 3071. Even today, many enthusiasts still refer to them by those names.

As products evolve, names change, and it can be difficult to keep up with every update. That's why we wanted to take a closer look at the current BNR ST71 V2, formerly known as the BNR 3071, and highlight some of the significant improvements that have been made over the years.

A Long-Time Favorite in the Focus ST Community

The BNR ST71 V2 has earned its reputation as one of the most popular turbo upgrades available for the Focus ST. Its appeal is simple: it's a true drop-in turbo kit that includes everything needed for installation while delivering massive power gains without requiring fuel system upgrades.

For around $1,650, the ST71 V2 remains one of the best dollar-per-horsepower modifications available for the platform. Many owners have seen gains of over 100 wheel horsepower compared to the factory turbocharger, making it a go-to option for enthusiasts looking to build a fast and reliable street car.

What's New with the ST71 V2?

When BNR transitioned from the original "3071" designation to the ST71 V2, the turbo received much more than just a new name.

The updated design now features:

• G30-660 journal bearing CHRA
• Enlarged 30mm wastegate port
• Upgraded oil drain line

These improvements provide several key benefits, including:

• Increased airflow capacity
• Improved overall efficiency
• Faster spool characteristics
• Greater power potential
• More reliability

With the proper supporting modifications, the ST71 V2 is capable of producing over 500 wheel horsepower, making it a serious contender for anyone pursuing a high-performance Focus ST build.

Why We Like It

For enthusiasts targeting the 400–500 WHP range, it's hard to overlook what the ST71 V2 offers. The combination of affordability, straightforward installation, proven reliability, and impressive power capability makes it one of the best turbocharger options available for the platform.

Whether you're building a quick street car or a weekend track machine, the ST71 V2 delivers an excellent balance of drivability and top-end performance.

Looking for Even More Power?

For those with bigger horsepower goals, BNR has also introduced the BNR ST770.

The ST770 utilizes:

• G30-770 ball bearing CHRA
• Enlarged 32mm wastegate port
• 3.5-inch anti-surge compressor housing (commonly referred to as a T51R-style compressor cover)

This setup is capable of supporting upwards of 600 wheel horsepower, with the Focus ST's cylinder head becoming one of the primary limiting factors at that level.

If your goal extends beyond the 500 WHP range and you're building a fully-supported engine package, the ST770 is worth serious consideration.

Final Thoughts

The BNR ST71 V2 continues to be one of the most compelling turbocharger upgrades available for the Focus ST. With modernized internals, improved efficiency, excellent spool characteristics, and the ability to surpass 500 WHP, it remains a proven solution for enthusiasts looking to maximize performance without overcomplicating their build.

For drivers seeking the best balance of cost, power, and simplicity, the ST71 V2 is still one of the strongest options on the market today.