SteamSpeed STX 58 Twin Turbos for BMW N54 aka "Stage 3"

The SteamSpeed STX 58 twin-turbos for BMW N54 is for making serious power all in a stock-location package.  How much power, in our testing, between 650-750 whp.  Expect numbers around 650 whp for pump gas cars with supporting boltons and modest boost levels, or up 750 whp maxing the turbos out with high octane fuel or multi-port meth injection. Regardless of how far you are going to take them, they are a lot of fun.  It is no longer nessicary to switch to a single turbo setup to make serious power and have fun.

The STX 58 twin turbos are also designed to still be responsive and therefore still fun to drive around town with the torque still coming in before 4k RPM.