GKR Performance

25/08/2026

TurboSystems N57N Upgrade Turbos — IN STOCK 🇬🇧

We now have a range of TurboSystems N57N upgrade turbochargers physically in stock at GKR Performance, ready for immediate dispatch:

🔺 Stage 2
🔺 Stage 2 Ball Bearing
🔺 Stage 3
🔺 Stage 4

No waiting for a turbo to be built or arrive from overseas.

More importantly:

THE PRICE YOU SEE IS THE PRICE YOU PAY.

✅ UK stock
✅ No import duty to pay afterwards
✅ No unexpected customs charges
✅ No additional import/handling fees
✅ Fully insured delivery
✅ Next-day delivery available

You simply pay the advertised turbo price plus delivery. That's it.

These are genuine TurboSystems N57N upgrade turbochargers, with several specifications available depending on the power level and intended use of the car.

We're also happy to advise on which stage is appropriate for your setup rather than simply selling the biggest turbo available. Supporting modifications, fuel system capability, sensors, cooling and the intended use of the vehicle all matter when choosing the correct turbo.

Available for supply only, or we can discuss the supporting hardware and calibration required to get the best from your chosen setup.

📦 In stock now at GKR Performance
🚚 Fully insured next-day UK delivery available

Message us for current pricing and availability.

14/08/2026

WORKSHOP & DYNO ASSISTANT – GKR PERFORMANCE

Full-time position
Salary: Dependent on experience

GKR Performance is looking for a reliable, motivated and practical individual to join our team as a Workshop & Dyno Assistant

This is a varied, hands-on role within a busy automotive performance and tuning workshop, combining workshop duties, vehicle preparation, dyno support, administration and social media.

Key Responsibilities

* Loading and safely securing vehicles on the dyno
* Vehicle preparation and general workshop duties
* Uploading tuned files to vehicles (training provided)
* Moving and positioning vehicles
* Cleaning vehicles, workshop areas and equipment
* Basic workshop/equipment maintenance
* Keeping the workshop clean and organised
* Responding to customer emails and preparing estimates
* General administrative duties
* Taking photos/videos and assisting with social media content
* Supporting the team with day-to-day tasks

Essential Requirements

* Full, clean UK driving licence
* Genuine interest in cars and the automotive industry
* Practical and comfortable with physical work
* Basic computer/email skills
* Good communication and attention to detail
* Reliable, punctual and hardworking
* Able to work independently and as part of a team
* Willing to learn and take on new responsibilities

Desirable but not essential: Previous workshop or mechanical experience, knowledge of vehicle tuning/ECU software, dyno experience, customer service/admin experience or social media content creation.

Specialist training will be provided, so previous tuning experience isn't essential. We're primarily looking for someone with the **right attitude**, who takes pride in their work, is dependable and isn't afraid to get stuck in.

If you're passionate about cars and want a varied role within the performance automotive industry, we'd like to hear from you.

To apply, send us your CV along with a brief message explaining why you'd be suitable for the role. You can Email them here: [email protected]

25/07/2026

A little something for myself...

After spending most of my time building and calibrating cars for everyone else, I finally treated myself.

Meet my BMW E65 745d.
Powered by the M67TU – BMW's legendary 4.4-litre twin-turbo V8 diesel.
A bit of BMW history...

• BMW's largest production diesel engine ever built. • Twin turbocharged V8. • 4421cc. • Produced around 329hp and 750Nm from the factory. • Discontinued without a direct successor.

In many ways it marked the end of BMW's V8 diesel era.

As most people know, I have a bit of a soft spot for unusual BMW engines, and this one has been on my wish list for a long time.

It's in lovely condition, completely standard, and I plan on keeping it that way for now while I get to know it.

I'm sure there will be plenty of interesting technical posts along the way, as these engines aren't something you see every day.

Who else appreciates the forgotten BMWs that never really got the recognition they deserved?

09/06/2026

05/06/2026

Mahle air filters trusted by GKR. OEM-quality fitment, reliable engine protection, and excellent filtration for everyday driving.

31/05/2026

BMW F31 335xd (2014) — 403.5hp With The DPF Still Intact

A lot of people will tell you that 400hp+ on a 335d means removing emissions equipment.

This car proves otherwise.

📈 Independently tested at Surrey Rolling Road, producing:
🔺 403.5hp

All while retaining a fully functional DPF system.

Modifications are straightforward and sensible:

✅ Intercooler upgrade
✅ Engine calibration
✅ Transmission calibration
✅ EGR optimisation
✅ Swirl flap optimisation
✅ DPF retained and fully operational

No smoke maps.
No disabled DPF strategies.
No shortcuts.
Just a properly calibrated setup designed to make reliable power while retaining the systems BMW engineered into the vehicle.

One thing often overlooked is that a healthy DPF is not the restriction many people assume it is. When the engine, turbochargers, sensors and calibration are all working together correctly, there is still plenty of performance available without removing it.

This result was achieved with the DPF remaining in place and functioning exactly as intended.

Independent dyno figures are always nice to see because they remove any doubt and provide a completely unbiased result.
403.5hp.
DPF retained.
Verified independently.
Real calibration.
Real protection.
Real results.

+

18/05/2026

BMW F31 320d LCI (B47) — Stage 1 Calibration
Stock hardware. Stock drivability. Just done properly.

This 320d LCI came in completely standard, factory rated at 190hp / 400Nm. Before calibration, we carried out full logging and dyno testing to confirm the car was healthy mechanically and performing as expected.

📊 Results:

Stock:
🔹 189hp
🔹 413Nm

GKR Stage 1:
🔺 226hp
🔺 513Nm

The virtual dyno data and dyno printouts correlate extremely closely, which is always a good sign of a healthy setup and accurate calibration.

This car also received our usual supporting calibration work including:

✅ Correct torque model calibration
✅ EGR optimization with DPF regeneration strategy retained
✅ Swirl flaps left fully active
✅ Factory safety and thermal protections retained.
✅ Additional enhanced protection strategies where beneficial

No disabled safeguards.
No “flash and hope”.

Just smooth, factory-like drivability with a substantial increase in usable torque and power throughout the rev range.

The result is a car that feels exactly how a 320d should have left the factory — responsive, efficient and properly calibrated.

Real calibration.
Real protection.
Real results.

08/05/2026

Something that’s been interesting recently…

We’ve had a few customers contact us lately who are now well over 100,000 miles on their GKR calibrations without issues — including a couple still running software originally done back in the GBW days.

Considering how much discussion there is online about tuned cars “not lasting”, it got us thinking.

It would actually be really interesting to hear from people running our software:

📍 How many miles have you covered?
📍 How long have you been running the tune?
📍 What vehicle is it on?

Whether it’s a daily driver, weekend car or full build — drop it in the comments 👇

(GKR or GBW software both count 😄)

01/05/2026

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24/04/2026

The fastest x1 previously virtual dyno ran at 360hp was on our new 4wd linked dyno today.

This is the tune it's been running the past year. M50d injectors next, watch this space 😎