High-performance N54 twin turbocharger kit for BMW 135i, 335i, 535i (2007–2010). Featuring billet 11-blade compressor wheels, 9-blade 713C turbine wheels, and a 10% larger Hi-Si Mo turbine housing — this direct-fit upgrade delivers faster spool, improved airflow, and the power potential to reach 500 HP on pump gas, and up to 650 HP with proper tuning and supporting mods. Built and precision-balanced in Michigan, USA, and includes gaskets and a 1-year warranty.