The Steamspeed 67+ 8CM ² is a great turbocharger for those looking to make 350-400 WHP with supporting modifications. Steamspeedâs STX line of turbochargers feature Garret GTX style billet compressor wheels, as well as light weight turbine wheels. However when compared to similar turbochargers in comparison, Steamspeedâs compressors are able to outflow producing more power over the entire power curve.