The CTS Turbo Boss turbocharger is tailor-made for the N55 engine in BMW 135i/235i F2x and 335i/435i F3x models. This high-performance turbocharger boasts a GTX3582R-style Gen2 ceramic ball-bearing CHRA with dual ball bearings, an MFS billet 10-blade compressor wheel, and a high-flow stainless steel..