Product description: Audi TT 225 hp 1.8T performance upgrade to approx. 320 hp / 405 NmThe kit includes: - KKK upgrade turbocharger K04/K06 (59.5>46.5mm)- Software optimization kit 4- 4x 470cc fuel injectors- reinforced intake hose- reinforced bypass valve- BMC high-performance sport air filter for 1.8TThe control unit must be sent to us, or schedule an appointment on site. The following components are also required for kit 4 to achieve the performance: Exhaust system stainless steel 70mm http://www.turbo-parts.de/Abgastechnik/Abgasanlagen/Audi/S3-8L-210/225PS/Auspuffanlage-fuer-Audi-S3-210-225PS-A3-Quattro-8L-o-70mm-Edelstahl-TUeV::1485.html1.8T S3 76mm downpipe stainless steel with 200 cell racing cat http://www.turbo-parts.de/1-8T-Tuning/Hosenrohre/Downpipe-fuer-Audi-S3-8L-1-8T-209PS-TT-225PS-o-76mm-Edelstahl-mit-200-Zellen-Rennkat::1756.htmlS3 upgrade turbo manifoldhttp://www.turbo-parts.de/Turbokruemmer-Turbo-Kruemmer/Audi/VW/Turbokruemmer-fuer-Audi-S3-210-TT-225PS-upgrade-Stahlguss-High-Flow::1522.htmlLarge intercooler