The same engine family sits across the Golf GTI Mk4 and lengthways in the Audi A4 B6. Remaps and most engine parts are shared, but the turbo, downpipe and intercooler are not: the Golf takes the K04-001, the A4 the K04-015.
Power by stage, car by car
| Car | Years | Mounted | Stock | Stage 1 | Stage 2 | Stage 3 | Stage 4 |
|---|---|---|---|---|---|---|---|
| VW Golf GTI Mk4 1.8T | 1998–2004 | Across the car (K04-001) | 150–180 PS | 187–225 hp | 195–235 hp | 240–280 hp | 320–380 PS |
| Audi A4 B6 1.8T | 2001–2005 | Lengthways (K04-015) | 150–190 PS | 195–225 hp | 208–240 hp | 247–265 hp | 320+ hp |
Figures are the tuners' own claims from each guide, on the fuel each tuner states.
What the guides say about this engine
- These are old cars: fix boost leaks, coils and the timing belt and tensioner before you tune. The VW Golf GTI Mk4 1.8T guide
- Integrated Engineering calls the stock rods the weak point around 300–400 hp, and the block is the same 06A in both cars. The Audi A4 B6 1.8T guide