Here is the next entry into the N54 Single Turbo kit game, but when I look at this all I can see is an expensive On3 kit:
BMW 135i/335i Single Turbo kit
•61mm Billet Ball Bearing Turbo
•SS Top mount V-band manifold
•44mm wastegate
•50mm Blow Off Valve
•SS 3" Downpipe
•SS 1.5" Dumptube
•Relocation tank
•7" Intercooler
•Aluminum piping kit
•Silicone hoses + clamps
•All water & Oil lines
•All necessary hardware
•Good up to 700whp
Starting at $6,500 Installed