Audi A4 B6 1.8T or VW Golf GTI Mk4 1.8T? Both use the 1.8T 20V turbo engine. Here's how far each one goes, using the makers' and tuners' own figures from our two guides.
At a glance
| Audi A4 B6 1.8T | VW Golf GTI Mk4 1.8T | |
|---|---|---|
| Years | 2001–2005 | 1998–2004 |
| Engine | 1.8T 20V turbo four, lengthways (AVJ, BFB, BEX; AMB in the US) | 1.8T 20V turbo four (AGU, AUM, ARZ, AUQ and others) |
| Stock power | 150, 163 or 190 PS (tuners' figures) | 150 PS / 210 Nm, or 180 PS / 235 Nm |
Power by stage
| Audi A4 B6 1.8T | VW Golf GTI Mk4 1.8T | |
|---|---|---|
| Stock | 150–190 PS | 150–180 PS |
| Stage 1 | 195–225 hp | 187–225 hp |
| Stage 2 | 208–240 hp | 195–235 hp |
| Stage 3 | 247–265 hp | 240–280 hp |
| Stage 4 | 320+ hp | 320–380 PS |
Figures are the tuners' own claims from each guide, on the fuel each tuner states.
Typical parts cost
| Audi A4 B6 1.8T | VW Golf GTI Mk4 1.8T | |
|---|---|---|
| Stage 1 | remaps $366.95 on sale (APR); turbo-parts Kit 1 with diverter valve and filter €399; BAR-TEK Stage 1 parts €480.62 (software extra). | remaps $366.95 on sale (APR) or $500–$550 (Unitronic, at UroTuning); turbo-parts Kit 1 with diverter valve and filter €399. |
| Stage 2 | turbo-parts Kit 2 with sports cat €795; Techtonics downpipe $286–$291 (no cat); front-mount intercooler €350 (turbo-parts) or CA$1,034.73 (CTS); BAR-TEK Stage 2 parts €1,478.35. | Unitronic Stage 2 file $600 (UroTuning); downpipe with sports cat £575.31 (Scorpion) or $890.78 on sale (Milltek); CTS intake $169.99; cat-back £432.53–$769.44 (Scorpion, Milltek). |
| Stage 3 | K04-015 turbo $2,045 (034) or APR's kit $2,608.95 on sale; turbo-parts hybrid Kit 3 €2,350. | K04 kits $1,954.78–$2,427.04 (GIAC / UroTuning) or $2,788.95 on sale (APR, with software); turbo-parts Kit 2 €1,679.99 or hybrid Kit 3 €2,500. |
List prices from the guides, before shipping, import tax and fitting. "—" means that guide has no cost line for the stage.
Where each one ends up
At Stage 4 the Audi A4 B6 1.8T reaches 320+ hp and the VW Golf GTI Mk4 1.8T 320–380 PS.