VAG 1.8T K03 transverse Upgrade turbocharger BorgWarner 53049887501 (K04-001 / 53049500001) KKK modified VAG 1,8T K03 Transverse Upgrade Turbocharger BorgWarner 53049887501 (K04-001 / 53049500001) Original part number: 5304 988 7501 (formerly: 5304 950 0001) Fits all VW / AUDI / SEAT K03 transverse engines The KKK K04-001 turbocharger is the most popular upgrade turbocharger for the 1.8T models with transverse engine and standard K03 turbocharger. So all 150hp and 180hp models. The KKK K04-001 turbo fits p&p like the standard K03. All outer dimensions are the same. This turbocharger has larger compressor and exhaust dimensions than the K03. Although KKK and many competitors give a maximum output of 265PS, but realistic tests of us with the right settings, a maximum performance of 220PS is achievable. However, this is not comparable to the performance of a chip tuned K03. The K04 is significantly stronger in the entire range with more torque! For optimum performance, we recommend replacing the intercooler with an LLK upgrade, installing a 76mm downpipe and, if necessary, an exhaust system with a metal catalyst with 100 cells. For more performance, choose our K04-001 stage 1 and stage 2 upgrade turbochargers. Maximum performance: 220hp (realistic, durable, high torque) Diameter compressor wheel: N.a. Diameter exhaust wheel: N.a. Fits: - Audi A3 (8L) 1.8T 150hp and 180hp - Audi TT (8N) 1.8T 150hp and 180hp - Seat Leon - Skoda Octavia