VTT - N55 Stage 1 JB Upgrade Kit (NEW)WHP Level supported (with proper fuel, upgrades, and tuning) Stock 425WHP Our NEW N55 Stage 1 upgrade consists of a brand new N55 turbo, custom cast and manufactured for VTT, this is coupled with a VTT custom reverse billet compressor wheel and brand new stock turbine. Stage 1 upgrade uses the stock plastic DV, but with the option to include a custom VTT Forge DV system, or a GFB DV+ system to replace the stock plastic DV parts which are prone to