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Project Hahn

Volkswagen Golf GTI MK5

Specs

Dyno sheet · claimed figures

power torque stock

This chart displays the peak figures only — 552 hp / 620 Nm (owner’s claim). Peak RPM isn’t recorded, so the curve shape and peak positions are illustrative, not a measured run.

552hp

620 NM

Torque

—

0–100

—

100–200

Stock 200 → +352 HPStock 280 → +340 NM

Drivetrain: FWD
Fuel: Petrol

The build

Full Stage 3+ big-turbo build. ~550 hp at the crank on E85.

Build progress (6)

DoneJun 28, 2026+82552hp
E85 tune — broke 550 on the dyno
552 hp on E85. Dyno day was a good day.
DoneApr 28, 2026+90470hp
Big turbo install — GTX2867R
Custom manifold, 3" exhaust, full fuel system. The fabrication took a month.
DoneFeb 28, 2026+60380hp
K04 hybrid + supporting mods
Loba K04, front-mount intercooler, HPFP. Spooled hard and stayed reliable.
DoneDec 28, 2025+120320hp
Stage 2: downpipe + tune
APR Stage 2 with a Milltek turbo-back. Instantly transformed the car.
DoneOct 28, 2025200hp
Picked up a clean MK5 shell
Found a rust-free GTI to base the project on. Bone stock to start.
Planned
Next up: sequential gearbox
The DSG is on its way out at this power. Saving for a proper box.

Parts list (9)

Documented investment€14,650

Turbo

🔧

Garrett GTX2867R Gen II

Garrett

€2,400

View part →

Ecu

🔧

Stage 3 custom flash (E85)

APR

€1,500

Intake

🔧

Carbon intake system

Eventuri

€650

View part →

Exhaust

🔧

Turbo-back 3" with sports cat

Milltek

€1,800

View part →

Cooling

🔧

Front-mount intercooler

Wagner Tuning

€700

Fuel

🔧

High-pressure fuel pump + injectors

Bosch

€900

Suspension

🔧

V3 coilovers

€1,900

View part →

Brakes

🔧

6-pot big brake kit

Brembo

€2,600

Wheels

🔧

18x8.5 forged

BBS

€2,200

Documented parts total (9 priced)€14,650

The MK5 file

Full model hub →

5 builds · 1 question · 1 problem (0 solved) · 0 owner reviews

Timing chain rattle on cold start — how urgent?Problem / fault · 0 replies→Which brake pads for occasional track days?Question · 0 replies→Stage 2 is done — sharing the full recipe + numbersBuild talk · 0 replies→

Seen in the Paddock

📸 ♥ 5

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Discussion

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Jonas Weber

@jonas · 🇩🇪

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Provenance

70/100

· Dyno verified0/30
✓ Power claim plausible+20
✓ Original photos+15
✓ 3+ progress milestones+15
✓ 5+ documented parts+10
✓ Stock baseline on record+10

Provenance grows automatically as the ownerdocuments the build — dyno sheet, original photos, milestones. Visitors can't add to it, but votes and fuel are how you back a build you believe in.

552

620

Score

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Project Hahn

Specs

The build

Build progress (6)

E85 tune — broke 550 on the dyno

Big turbo install — GTX2867R

K04 hybrid + supporting mods

Stage 2: downpipe + tune

Picked up a clean MK5 shell

Next up: sequential gearbox