Miguel's G82 M4 Build

On Apr 23, 2026By Obie Cuevas / 0 comments

Miguel's 2023 G82 M4 — 900+ HP Build | Kies Motorsports

Build Documentation · 2023 G82 M4 · S58

Miguel's
M4

2023 BMW G82 M4 Competition · S58 · Stock Motor

469

Stock WHP

910

Final WHP

782

Final LB-FT

+441

HP Gained

Watch the full build video — BK walks through every stage, every dyno pull, and the final reveal

Watch on YouTube

Stage 0

Stock_WHP

Factory Baseline

Before anything touched, Miguel's car ran on 93 octane with only a downpipe. BMW rates the M4 Competition at 503 hp at the crank — here's what it actually makes at the wheels.

Wheel HP

468

Wheel TQ

495 lb-ft

Fuel

93 Oct

What's already on the car

Exhaust

Aftermarket

Downpipe

The only mod present at the stock baseline pull. Running catless for maximum exhaust flow.

Already Installed

Stage 1

600_WHP

DME Unlock · Tune · Intake

The foundation every build starts with. Unlock the factory-locked DME, flash a Stage 2 93-octane tune, and free up airflow with a proper intake. This is where the S58 starts showing what it can do.

Wheel HP

592–598

Wheel TQ

579–582 lb-ft

Gain

+126 HP

Fuel

93 Oct

"BMW locks down the DME because they don't want you to have fun — but we want you to have fun. So we now offer a service where we can unlock these here in the United States."

BK — from the video

Parts on Miguel's car at this stage

Required First Kies Service

Kies Motorsports

The S58 is factory-locked. Nothing else on this list works without this step first. Kies performs this domestically — no international shipping. Works on all 2020+ G80, G82, G87.

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Bootmod3 License

Stage 2 93-octane tune on Miguel's car at this stage. The S58 tuning platform of choice — proven, flex-fuel capable, with OTS maps that have been validated on thousands of G8X cars.

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S58 Intake System

Paired with the Stage 2 tune on this dyno pull. High-flow silicone design engineered for the S58 — prevents airflow from being the limiting factor as boost climbs.

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Stage 2

700_WHP

Flex Fuel · Cooling · Drivetrain

Adding ethanol opens up significantly more power. But going fast and staying alive are two different things — this stage adds the thermal management and drivetrain support to make 700 WHP last.

"Just by going to E40 — forty percent E85 — you're going to be very close to, if not hit, seven hundred horsepower to the wheels. We see it time and time again."

BK — from the video

↑ Includes all Stage 1 parts — DME unlock, BM3 tune (now flashed with a flex-fuel multimap), and do88 intake all carry over.

Added at this stage — Miguel's car

Bootmod3 License

The BM3 license is reflashed here with a flex-fuel multimap tune to support ethanol operation. The same license from Stage 1 — just an updated calibration.

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Required Ignition

S58 Spark Plug Bundle

One step colder, gapped for boost. Non-negotiable when running ethanol — the whole 6-pack for the S58. Prevents misfires that could cause serious engine damage at elevated power.

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Transmission Cooler

71% larger cooler than factory. BK: "The more heat you have in your transmission, the more wear and tear you're going to see on your clutches — it's basically going to lead to an early death to your transmission." He's seen it happen firsthand on an X5 M.

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Engine Oil Cooler

57% larger core than stock. Sits underneath the car and keeps engine oil as cool as possible. When you're adding several hundred horsepower, you have a lot more heat being generated — this preserves and protects a stock engine.

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S58 Intake Manifold / Charge Cooler

62% larger core. All-aluminum construction vs. the factory metal-crimped-onto-plastic design that can separate under high boost. Also has secondary fueling ports — the ones Miguel uses for port injection — plus NPT ports for water-meth or nitrous if desired. This one was powder coated to match the turbo.

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S58 Charge Pipe

Massive aluminum piece replacing the factory plastic charge pipe. BK: "When you start to turn up the boost, what we're seeing is inconsistencies in tuning as the rubber hoses expand and contract — adding this solves all of those problems." Also has NPT ports for methanol injection.

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TCU Flash — 8-Speed

BK's secret weapon: "I was stuck at 10.0, 10.0, 10.0. I flashed it with XHP and with that additional clamping force and the speed of the transmission, I was finally able to break into the nines for the first time." Removes torque limiters, faster shifts, increased clutch clamping force.

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Forged VS-5RS — Rear Set

Miguel's rear wheels. Powder coated. Forged monoblock construction keeps unsprung weight low — important when you're putting this much power through the rear axle.

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Mickey Thompson

ET Street S/S — 285/35R19

DOT drag radials wrapped around the APEX VS-5RS wheels on the rear. BK: "While he has great all-seasons on the car, he's never, ever gonna hook at the track." These are what actually put Miguel's numbers on the pavement.

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Extreme Contact DWS06+ 285/35 R19

All-season street rubber up front. Balances the drag radials in the rear — keeps the car drivable on the street while the Mickey Thompsons do their job out back.

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Stage 3

900+_WHP

Single Turbo · Full Fueling · Final Build

This is the completed car. Single turbo conversion, standalone auxiliary fuel system, port injection, full cooling stack. Miguel's final pull: 910 WHP / 782 lb-ft on E85. Stock motor.

Wheel HP

910

Wheel TQ

782 lb-ft

Gain

+441 HP

Fuel

E85

"The benefit of a big single is you don't have to build your motor. With hybrids the power comes in so much stronger and more aggressive — if you don't build your motor and try to hit some of these numbers, you can bend your rod. The big single moves your power band down. Your torque comes in later, which is much safer for your rods."

BK — from the video

↑ Includes all Stage 1 & 2 parts — DME unlock, BM3 flex tune, do88 intake, plugs, charge pipe, trans and oil cooling, XHP TCU, wheels and tires all remain on the car.

Added at this stage — completing Miguel's build

BM3 Rev2 with Flexfuel & Sensor Kit

Acts as a secondary DME fully integrated with the factory DME — controls port injection, flex fuel, and adds safety layers for the motor. BK: "When there's a software solution and they make a hardware component, it just makes the most sense to use them because they're going to work hand in hand together." Tuned remotely by HCP from Denmark.

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Required Turbo Kit

S58 Single Turbo Kit

Running a Precision Next Gen 7275 — capable of well over 1,000 WHP. BK: "This DocRace kit was one of the best fitting kits I've ever installed and it looks absolutely incredible." Includes catch can, all oil/coolant lines, hardware. The coolant reservoir was rerouted and painted Isle of Man Green to match the car.

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Front Intercooler / Radiator

Sits in the corner of the front bumper alongside the auxiliary radiator. Part of the complete do88 cooling package — BK chose do88 across the board for their effectiveness, affordability, and the fact that they offer everything as a bundle.

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Auxiliary Radiator

Driver's side of the front bumper, paired with the heat exchanger, trans cooler, and oil cooler behind the bumper. Everything fit without a single modification — BK noted this specifically during the walk-around.

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Required Fueling

Precision Racewerks

G8X Standalone Aux Fuel System

The AFS 460 kit. Leaves the stock high-pressure fuel pump and stock injectors completely untouched. Adds a dedicated secondary pump whose only job is to power the six new port injectors. BK runs the same setup on his personal 1,040 WHP G80.

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Required Fueling

Fuel Injector Clinic

1000cc Port Injectors

1,000cc port injectors powered entirely by the PRW secondary fuel pump — completely separate from the factory DI system. The do88 charge cooler manifold's secondary injection ports are what make this installation clean and OEM-looking.

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S58 Oil Catch Can Kit

Included with the DocRace kit. BK: "They have this really cool bracket and it fits absolutely perfect." Mounted cleanly in the engine bay — no hacked-together mounting.

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eB2 4-Port Boost Solenoid

Precise boost control for the tuner at elevated pressure. Gives HCP the resolution to dial in a smooth, linear power curve — exactly what you saw on the 93 octane street map: no giant torque spikes, calm and collected.

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5W30 Special Tec B FE

BMW-spec full synthetic. Installed fresh as part of the complete build — BK did a full oil service on the car during the install process. Don't skimp on fluids at this power level.

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Pro-Line Turbo Additive

Added during the build install — specifically called out in the video install section. Reduces turbo bearing wear and helps protect the new single turbo during break-in.

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BMW Oil Filter Kit

OEM-supplier grade filtration. Fresh oil filter as part of the build service. Hengst is a BMW OEM supplier — this is what the factory uses.

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Evo XL Carbon Seat

Paired with a Kies-exclusive Alcantara and carbon rear seat delete by Seat X for weight savings. BK: "By removing the rear seat, you're going to save over forty pounds — for every hundred pounds you save, you gain roughly a tenth of a second off your quarter mile." The seat delete looks factory with any color interior.

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Required Transmission

Stage 1+ Transmission

Handled off-camera before the final build. BK: "Regardless of what software, your transmission will start to slip around that 800 HP mark, if not even a little bit sooner." A built transmission is what makes 900 WHP reliable rather than a liability.

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TERMS (REQUIRED)

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